WO2022151401A1 - 一种通信方法、终端装置及系统 - Google Patents

一种通信方法、终端装置及系统 Download PDF

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Publication number
WO2022151401A1
WO2022151401A1 PCT/CN2021/072278 CN2021072278W WO2022151401A1 WO 2022151401 A1 WO2022151401 A1 WO 2022151401A1 CN 2021072278 W CN2021072278 W CN 2021072278W WO 2022151401 A1 WO2022151401 A1 WO 2022151401A1
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WO
WIPO (PCT)
Prior art keywords
terminal device
time
frequency resources
time slot
information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2021/072278
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English (en)
French (fr)
Inventor
苏宏家
董蕾
郭文婷
卢磊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to EP21918605.3A priority Critical patent/EP4247087A4/en
Priority to CN202180055620.3A priority patent/CN116158179A/zh
Priority to MX2023008345A priority patent/MX2023008345A/es
Priority to PCT/CN2021/072278 priority patent/WO2022151401A1/zh
Publication of WO2022151401A1 publication Critical patent/WO2022151401A1/zh
Priority to US18/221,030 priority patent/US20230362895A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/46—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for vehicle-to-vehicle communication [V2V]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/40—Resource management for direct mode communication, e.g. D2D or sidelink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H04B7/06952—Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping
    • H04B7/06954—Sidelink beam training with support from third instance, e.g. the third instance being a base station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/25—Control channels or signalling for resource management between terminals via a wireless link, e.g. sidelink

Definitions

  • the present application relates to the field of communication, and more particularly, to a communication method, terminal device and system.
  • V2X communication refers to the communication between vehicles and anything in the outside world, including vehicle-to-vehicle (V2V), vehicle-to-pedestrian (V2P) communication ), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N) communications.
  • V2V vehicle-to-vehicle
  • V2P vehicle-to-pedestrian
  • V2I vehicle-to-infrastructure
  • V2N vehicle-to-network
  • V2X communication is aimed at high-speed equipment represented by vehicles, and is the basic technology and key technology applied in scenarios with very high communication delay requirements in the future, such as scenarios such as smart cars, autonomous driving, and intelligent transportation systems.
  • V2X communication can support communication scenarios with and without network coverage, and its resource allocation methods include the method of allocating V2X transmission resources based on the network and the method of terminals autonomously selecting V2X transmission resources.
  • the sending terminal selects resources by performing sensing, and receives sideline information sent from other terminals in the resource pool within the sensing window. If the sending terminal cannot or does not listen on a certain time slot in the listening window, that is, it cannot know the resource occupancy status of other terminals on the time slot, for example, the sending terminal is in the sending state in the time slot, because the The half-duplex reason cannot transmit and receive at the same time. At this time, the transmitting terminal excludes the time slot from being located in the resource selection window of the transmitting terminal after several resource reservation periods according to the configured or pre-configured or predefined resource reservation period information. All resources in the corresponding time slot within the time slot, these excluded resources will not be used to send the terminal to send information to other terminals. This easily leads to excessive exclusion of resources, reducing available resources and reducing resource utilization.
  • the present application provides a communication method, terminal device and system, which can improve resource utilization.
  • V2X communication vehicles will encounter many unexpected traffic situations during driving. For example, a vehicle stops in the fast lane due to engine damage on the highway. This vehicle (ie, the sending terminal) will send this parking information In the first time slot, it is sent to other vehicles around it. Then, the sending terminal does not arrange warning signs as required, causing the vehicle behind it to collide with it. The sending terminal needs to send the collision information to other vehicles around it.
  • the transmitting terminal cannot receive signals from other vehicles on the first time slot in the listening window where it sends parking information, so it cannot evaluate the resource occupancy on the first time slot.
  • the prior art adopts the most conservative approach, that is, all the resources that cannot be evaluated due to the half-duplex limitation mentioned above are completely excluded.
  • the auxiliary terminal is used instead of the sending terminal to evaluate the resource occupancy situation on the first time slot, and the evaluation result is indicated to the sending terminal, and the sending terminal will determine the first time slot according to the evaluation result indicated by the auxiliary terminal. Which resources in a time slot can be used for the sending terminal to determine the resources for sending the collision information, instead of excluding all the resources, which improves the resource utilization rate.
  • a communication method is provided, the method being performed by a first terminal device.
  • the first terminal device may be a first terminal device or a component in the first terminal device, and the first terminal device may be an auxiliary terminal in V2X communication.
  • the vehicle for resource assessment may be a Road Side Unit (RSU), and the components in the first terminal device may be, for example, a processor, an in-vehicle communication module, a chip or a chip system, etc. loaded in the auxiliary terminal.
  • RSU Road Side Unit
  • the method includes: a first terminal device receiving first sideline information from a third terminal device on a first time slot; and the first terminal device determining, according to the first sideline information, available in the first time slot time-frequency resources and/or unavailable time-frequency resources; the first terminal device sends first indication information to the second terminal device, where the first indication information is used to indicate the time-frequency resources available in the first time slot frequency resources and/or unavailable time-frequency resources, the first time slot is a time slot in which the second terminal device sends the second sideline information.
  • the second terminal device sends the second sideline information in the first time slot, so that it cannot listen to the time-frequency resources or reserved time-frequency resource information used by other terminal devices to send the sideline information.
  • the first time slot can learn the time-frequency resources or reserved time-frequency resource information used by other terminal devices to send sideline information by listening, and pass the determined available time-frequency resources and/or unavailable time-frequency resources through the first time-frequency resource.
  • Indicating the indication information to the second terminal device can prevent the second terminal device from excluding all available periodic time-frequency resources based on the resource reservation period information, so as to increase the available time-frequency resources, thereby improving resource utilization.
  • a vehicle colliding on a highway receives first indication information sent by auxiliary vehicles around it, and the first indication information indicates that the vehicle in the collision is unable to perform resource evaluation on the first time slot due to sending parking information.
  • the collision-occurring vehicle will consider the available time-frequency resources and/or unavailable time-frequency resources in the first time slot according to the first indication information when determining the resource for sending the collision information, instead of using the first time-frequency resource. All resources corresponding to a time slot are excluded, thereby improving resource utilization.
  • the method further includes: the first terminal device receiving the second sideline information from the second terminal device on the first time slot; the first terminal device The device determines, according to the second sideline information received from the second terminal device on the first time slot, that the first time slot is the time when the second terminal device sends the second sideline information gap.
  • the first terminal device can determine which time slots are the time slots for the second terminal device to send information, and can perform more targeted resource assistance for the second terminal device, so as to improve resource utilization, it can further improve reliability.
  • the auxiliary vehicle can determine which time slots are the time slots for the colliding vehicle to send information, and then perform resource assessment on behalf of the colliding vehicle on this time slot.
  • the first time slot is located in the listening window of the second terminal device.
  • the first time slot includes at least one subchannel, and at least one first subchannel in the first time slot is used for the second terminal device to send the second sideline information, the at least one first subchannel belongs to the at least one subchannel.
  • the first terminal device determines available time-frequency resources and/or unavailable time-frequency resources in the first time slot according to the first sideline information, including: the first A terminal device determines, according to the first sideline information and/or the second sideline information, available time-frequency resources and/or unavailable time-frequency resources in all subchannels of the first time slot; or , the first terminal device determines, according to the first sideline information, available time-frequency resources and/or available time-frequency resources in the remaining subchannels of all subchannels of the first time slot except the at least one first subchannel or unavailable time-frequency resources.
  • the first indication information is used to indicate available time-frequency resources and/or unavailable time-frequency resources in all subchannels of the first time slot; or, the first indication The information is used to indicate available time-frequency resources and/or unavailable time-frequency resources in the remaining subchannels except the at least one first subchannel in all subchannels of the first time slot.
  • the first terminal device determines, according to a first threshold, available time frequencies in the remaining subchannels except the at least one first subchannel in all subchannels of the first time slot resources and/or unavailable time-frequency resources; the first terminal device determines, according to a second threshold, available time-frequency resources and/or unavailable time-frequency resources in the at least one first subchannel, the first The second threshold is greater than the first threshold.
  • the second threshold is greater than the first threshold, the remaining sub-channels in the at least one first sub-channel compared to all the sub-channels in the first time slot except the at least one first sub-channel In the channel, it is easier to determine the available resources, which further improves the resource utilization rate.
  • the first terminal device sends the first indication information to the second terminal device on a physical sideline feedback channel.
  • a communication method is provided, the method being performed by a second terminal device.
  • the second terminal device includes a second terminal device or a component in the second terminal device, and the second terminal device may be a data transmitter in V2X communication, for example, it may be necessary to
  • the relevant information of the accident is sent to the sender vehicle of other vehicles, or it can be the Road Side Unit (RSU) that has detected the sudden traffic accident, and the components in the second terminal device can be, for example, loaded in the sender.
  • RSU Road Side Unit
  • the method includes: a second terminal device sends second sideline information to a first terminal device in a first time slot; the second terminal device receives first indication information from the first terminal device, the first indication The information is used to indicate the available time-frequency resources and/or the unavailable time-frequency resources in the first time slot, wherein the available time-frequency resources and/or the unavailable time-frequency resources in the first time slot are The first terminal device determines according to the first sideline information received from the third terminal device in the first time slot; the second terminal device determines to send the third sideline according to the first indication information Time-frequency resources of information.
  • the second terminal device sends the second sideline information in the first time slot, so that it cannot listen to the time-frequency resources or reserved time-frequency resource information used by other terminal devices to send the sideline information.
  • the first time slot can learn the time-frequency resources or reserved time-frequency resource information used by other terminal devices to send sideline information by listening, and pass the determined available time-frequency resources and/or unavailable time-frequency resources through the first time-frequency resource.
  • Indicating the indication information to the second terminal device can prevent the second terminal device from excluding all available periodic time-frequency resources based on the resource reservation period information, so as to increase the available time-frequency resources, thereby improving resource utilization.
  • a vehicle colliding on a highway receives first indication information sent by auxiliary vehicles around it, and the first indication information indicates that the vehicle in the collision is unable to perform resource evaluation on the first time slot due to sending parking information.
  • the collision-occurring vehicle will consider the available time-frequency resources and/or unavailable time-frequency resources in the first time slot according to the first indication information when determining the resource for sending the collision information, instead of using the first time-frequency resource. All resources corresponding to a time slot are excluded, thereby improving resource utilization.
  • the first time slot is located in the listening window of the second terminal device.
  • the first time slot includes at least one subchannel
  • the second terminal device transmits the data to the first terminal device in at least one first subchannel of the first time slot.
  • the second sideline information, the at least one first subchannel belongs to the at least one subchannel.
  • the first indication information is used to indicate available time-frequency resources and/or unavailable time-frequency resources in all subchannels of the first time slot; or, the first indication The information is used to indicate available time-frequency resources and/or unavailable time-frequency resources in the remaining subchannels except the at least one first subchannel in all subchannels of the first time slot.
  • available time-frequency resources and/or unavailable time-frequency resources in the remaining subchannels except the at least one first subchannel in all subchannels of the first time slot are based on determined by a first threshold; available time-frequency resources and/or unavailable time-frequency resources in the at least one first subchannel are determined according to a second threshold, and the second threshold is greater than the first threshold.
  • the second threshold is greater than the first threshold, the remaining sub-channels in the at least one first sub-channel compared to all the sub-channels in the first time slot except the at least one first sub-channel In the channel, it is easier to determine the available resources, which further improves the resource utilization rate.
  • the second terminal device receives the first indication information from the first terminal device on a physical sideline feedback channel.
  • a third aspect provides a first terminal device, where the first terminal device can perform the method provided in the first aspect, and the first terminal device specifically includes: a transceiver unit configured to receive data from a third terminal device in a first time slot the first sideline information; the processing unit is configured to determine, according to the first sideline information, available time-frequency resources and/or unavailable time-frequency resources in the first time slot; the transceiver unit is further configured to , sending first indication information to the second terminal device, where the first indication information is used to indicate available time-frequency resources and/or unavailable time-frequency resources in the first time slot, and the first time slot is The second terminal device transmits the time slot of the second sideline information.
  • the transceiver unit is further configured to receive the second sideline information from the second terminal device on the first time slot; the processing unit is further configured to, according to the Receiving the second sideline information from the second terminal device on the first time slot determines that the first time slot is a time slot in which the second terminal device sends the second sideline information.
  • the first time slot is located in the listening window of the second terminal device.
  • the first time slot includes at least one subchannel, and at least one first subchannel in the first time slot is used for the second terminal device to send the second sideline information, the at least one first subchannel belongs to the at least one subchannel.
  • the processing unit is specifically configured to: determine, according to the first sideline information and/or the second sideline information, available time slots in all subchannels of the first time slot frequency resources and/or unavailable time-frequency resources; or, according to the first sideline information, determine the remaining subchannels in all subchannels of the first time slot except the at least one first subchannel Available time-frequency resources and/or unavailable time-frequency resources.
  • the first indication information is used to indicate available time-frequency resources and/or unavailable time-frequency resources in all subchannels of the first time slot; or, the first indication The information is used to indicate available time-frequency resources and/or unavailable time-frequency resources in the remaining subchannels except the at least one first subchannel in all subchannels of the first time slot.
  • the processing unit is specifically configured to: determine, according to a first threshold, available sub-channels in the remaining sub-channels except the at least one first sub-channel among all the sub-channels of the first time slot time-frequency resources and/or unavailable time-frequency resources; determining available time-frequency resources and/or unavailable time-frequency resources in the at least one first subchannel according to a second threshold, where the second threshold is greater than the the first threshold.
  • the transceiver unit is further configured to send the first indication information to the second terminal device on a physical sideline feedback channel.
  • a second terminal device configured to perform the method provided in the second aspect, and the second terminal device specifically includes: a transceiver unit, configured to transmit to the first terminal device in a first time slot second sideline information; the transceiver unit is further configured to receive first indication information from the first terminal device, where the first indication information is used to indicate the time-frequency resources available in the first time slot and the /or unavailable time-frequency resources, wherein the available time-frequency resources and/or the unavailable time-frequency resources in the first time slot are obtained by the first terminal device according to the The first sideline information of the third terminal device is determined; the processing unit is configured to determine the time-frequency resource for sending the third sideline information according to the first indication information.
  • the first time slot is located in the listening window of the second terminal device.
  • the first time slot includes at least one subchannel
  • the second terminal device transmits the data to the first terminal device in at least one first subchannel of the first time slot.
  • the second sideline information, the at least one first subchannel belongs to the at least one subchannel.
  • the first indication information is used to indicate available time-frequency resources and/or unavailable time-frequency resources in all subchannels of the first time slot; or, the first indication The information is used to indicate available time-frequency resources and/or unavailable time-frequency resources in the remaining subchannels except the at least one first subchannel in all subchannels of the first time slot.
  • available time-frequency resources and/or unavailable time-frequency resources in the remaining subchannels except the at least one first subchannel in all subchannels of the first time slot are based on determined by a first threshold; available time-frequency resources and/or unavailable time-frequency resources in the at least one first subchannel are determined according to a second threshold, and the second threshold is greater than the first threshold.
  • the transceiver unit is further configured to receive the first indication information from the first terminal device on a physical sideline feedback channel.
  • a communication device comprising: a processor, the processor is coupled to at least one memory, and the processor is configured to read a computer program stored in the at least one memory to execute the above first aspect or a method in any possible design of the first aspect, or a method in any possible design of the second aspect or the second aspect above.
  • a computer-readable storage medium stores a computer program; when the computer program is run on a computer, the computer can execute any possible design of the first aspect or the second aspect. Methods.
  • a computer program product which, when run on a computer, causes the computer to perform the methods described in the above-mentioned first to second aspects or any possible designs thereof.
  • a chip including: a processor and a communication interface, where the processor is configured to read an instruction or a computer program to execute the method in any possible design of the first aspect or the second aspect.
  • a communication system including the first terminal device in the method of the first aspect, and the second terminal device including the method of the second aspect.
  • Figure 1 is a schematic diagram of a vehicle communicating with external things.
  • FIG. 2 is a logical schematic diagram of a time domain unit according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of resource selection.
  • FIG. 4 is a schematic diagram of a communication scenario to which this embodiment of the present application is applicable.
  • FIG. 5 is a schematic flow interaction diagram of a communication method according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a resource selection according to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of another resource selection according to an embodiment of the present application.
  • FIG. 8 is a schematic diagram of sending first indication information according to an embodiment of the present application.
  • FIG. 9 is a schematic block diagram of a communication apparatus according to an embodiment of the present application.
  • FIG. 10 is a schematic block diagram of another communication apparatus according to an embodiment of the present application.
  • FIG. 11 is a schematic block diagram of another communication apparatus according to an embodiment of the present application.
  • FIG. 12 is a schematic block diagram of a communication system according to an embodiment of the present application.
  • a terminal device such as a terminal device, or a module for realizing the functions of the terminal device, such as a chip system, and the chip system can be set in the terminal device.
  • Terminal devices include devices that provide users with voice and/or data connectivity, specifically, devices that provide users with voice, or devices that provide users with data connectivity, or devices that provide users with voice and data connectivity .
  • it may include a handheld device with wireless connectivity, or a processing device connected to a wireless modem.
  • the terminal equipment can communicate with the core network via a radio access network (RAN), exchange voice or data with the RAN, or exchange voice and data with the RAN.
  • RAN radio access network
  • the terminal equipment may include user equipment (UE), wireless terminal equipment, mobile terminal equipment, device-to-device (D2D) terminal equipment, V2X terminal equipment, machine-to-machine/machine-type communication ( machine-to-machine/machine-type communications, M2M/MTC) terminal equipment, Internet of things (Internet of things, IoT) terminal equipment.
  • UE user equipment
  • D2D device-to-device
  • V2X terminal equipment
  • machine-to-machine/machine-type communication machine-to-machine/machine-type communications
  • M2M/MTC Internet of things terminal equipment
  • IoT Internet of things
  • the terminal device may be a vehicle or terminal-type roadside unit, or a communication module or chip built into the vehicle or roadside unit. As shown in Figure 1, a schematic diagram of the communication between the vehicle and the external things is shown.
  • direct communication (PC5) interface communication is supported between terminal devices, that is, transmission through a side link is supported.
  • the terminal device may also be a wearable device.
  • Wearable devices can also be called wearable smart devices or smart wearable devices, etc. It is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes. Wait.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-scale, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, which needs to cooperate with other devices such as smart phones.
  • Use such as all kinds of smart bracelets, smart helmets, smart jewelry, etc. for physical sign monitoring.
  • the various terminal devices described above if they are located on the vehicle (for example, placed in the vehicle or installed in the vehicle), can be considered as on-board terminal equipment.
  • the on-board terminal equipment is also called on-board unit (OBU). ).
  • the terminal device may further include a relay (relay).
  • a relay relay
  • any device capable of data communication with the base station can be regarded as a terminal device.
  • Network equipment including, for example, access network (AN) equipment, such as a base station (for example, an access point), which may refer to a device in the access network that communicates with wireless terminal equipment over the air interface through one or more cells , or, for example, a network device in a V2X technology is a road side unit (RSU).
  • the RSU can be a fixed infrastructure entity supporting V2X applications and can exchange messages with other entities supporting V2X applications.
  • the network equipment may include the next generation node B (gNB) in the fifth generation mobile communication technology (the 5th generation, 5G) new radio (new radio, NR) system (also referred to as the NR system for short), or also It may include a centralized unit (centralized unit, CU) and a distributed unit (distributed unit, DU) in a cloud radio access network (cloud radio access network, Cloud RAN) system, which is not limited in this embodiment of the present application.
  • gNB next generation node B
  • 5G fifth generation mobile communication technology
  • NR new radio
  • NR new radio
  • NR new radio access network
  • Cloud RAN cloud radio access network
  • the sideline communication between the terminal device and the terminal device has two transmission modes, namely the scheduling mode by the network device (usually called transmission mode 1, Transmission Mode 1) and the user's autonomous resource selection mode (usually called transmission mode 2) , Transmission Mode 2).
  • the terminal device Under the network coverage, the terminal device receives the system information block (SIB) of the network device, the cell-specific radio resource control (RRC) signaling or the user-level (UE-specific) RRC signaling obtains SL resource pool (resource pool) configuration information.
  • SIB system information block
  • RRC radio resource control
  • UE-specific user-level
  • RRC user-level
  • the terminal device may also use the SL resource pool configuration information pre-configured by the device at the factory, for example, when there is no network coverage.
  • the SL resource pool configuration information is used to indicate the SL resource pool, and the resource pool is a set of time-frequency resources used for sideline communication between UEs.
  • the resource pool may include code domain resources.
  • the resources of the resource pool are used to include the resources for the terminal device to send and receive at least one of the following physical channels, such as PSCCH, PSSCH, PSDCH, PSFCH, PSBCH, etc.
  • the types of services carried by PSSCH may include unicast, multicast and/or broadcast Communication type.
  • the time domain of the SL resource pool includes one or more time units.
  • the time unit may be one symbol, several symbols, one time slot, one subframe, one frame, etc.
  • One or more time units may be in the time
  • the frequency domain unit can be a resource element (RE), several REs, and a resource block (resource block, RB), several RBs, one subchannel (subchannel), several subchannels, and one subchannel includes one or more continuous or non-continuous RBs in the frequency domain.
  • the time slot is used for description, but it is not limited to the time unit only.
  • the unit is sub-channel only.
  • time slots contained in a resource pool are logically consecutive, and these time slots are called logical time slots.
  • FIG. 2 a schematic diagram of logical time slots is shown, wherein time slot 1 to time slot 8 are consecutive time slots in time, and these time slots are called physical time slots.
  • a resource pool is configured to include time slot 1, time slot 3, time slot 5 and time slot 8 in the time domain. Although these time slots are not all consecutive in time, from the perspective of the resource pool, all of them are Including these time slots is relatively continuous, and these time slots are called logical time slots.
  • Time slot 1', time slot 2', time slot 3' and time slot 4' are respectively physical time slot 1, physical time slot 3, physical time slot 5 and physical time slot 8 in the corresponding logical time of the resource pool. gap.
  • the resource pool configuration information also includes resource reservation period (resource reservation period) information
  • the resource reservation period information may indicate a set of resource reservation period values ⁇ P 1 , P 2 , P 3 ,..., P i ⁇ , where i is greater than or equal to A positive integer of 1, for example, the set of values includes 16 different resource reservation period values, ⁇ P 1 , P 2 , P 3 ,...,P 16 ⁇ .
  • the value of the resource reservation period value may be any integer value from 0 to 99, or 100, 200, 300, . . . , 1000, etc., and the unit may be milliseconds or time slots.
  • the ⁇ P 1 , P 2 , P 3 , . . . , P i ⁇ are physical time.
  • the value of the logical resource reservation period corresponding to ⁇ P 1 ,P 2 ,P 3 ,...,P i ⁇ is ⁇ P' 1 ,P' 2 ,P' 3 ,...,P' i ⁇
  • the unit of ⁇ P′ 1 , P′ 2 , P′ 3 , . . . , P′ i ⁇ may be a time slot. It can be understood that when a resource pool includes time slots that are consecutive in time, that is, the resource pool is consecutive in physical time, the logical time slots and physical time slots of the resource pool are equal.
  • the resource reservation period value information is used to indicate a set of resource reservation period values that the terminal device may allow in the resource pool, that is, the terminal device uses a certain resource reservation period value in the resource reservation period set to periodically send SL information .
  • the terminal device determines resource selection by performing sensing. Specifically, the method for determining resource selection based on the sensing includes:
  • a terminal device generates SL information to be sent at time slot n.
  • the SL information includes a physical layer sidelink shared channel (PSSCH) and a physical layer sidelink control channel (PSCCH). ), physical broadcast control channel (PSBCH), physical sidelink feedback channel (PSFCH), and physical downlink control channel (PDCCH) in the physical layer at least one.
  • PSSCH physical layer sidelink shared channel
  • PSCCH physical layer sidelink control channel
  • PSBCH physical broadcast control channel
  • PSFCH physical sidelink feedback channel
  • PDCCH physical downlink control channel
  • the method for a terminal device to determine a transmission resource for sending sidelink information by listening to a time-frequency resource set may include:
  • the terminal device triggers the resource selection process at time slot n, and determines the time-frequency resource for sending the SL information to be sent.
  • SL information includes physical layer sidelink shared channel (PSSCH), physical layer sidelink control channel (physical sidelink control channel, PSCCH), physical layer broadcast control channel (physical broadcast control channel, PSBCH) , at least one of a physical layer sidelink feedback channel (physical sidelink feedback channel, PSFCH), and a physical layer sidelink data channel (physical sidelink data channel, PSDCH).
  • PSSCH physical layer sidelink shared channel
  • PSCCH physical layer sidelink control channel
  • PSBCH physical layer broadcast control channel
  • PSFCH physical sidelink feedback channel
  • PSDCH physical layer sidelink data channel
  • the types of services carried by the PSSCH may include unicast, multicast and/or broadcast communication types.
  • the expression [A, B] in this application represents a value range including boundary points A and B
  • the expression (A, B) represents a value range that does not include boundary points A and B at the same time.
  • the expression [A, B) represents the value range that includes the boundary point A and does not include the boundary point B
  • the expression (A, B] represents the value range that does not include the boundary point A and includes the boundary point B. This will not be repeated elsewhere in the text.
  • the terminal device is within a listening window, e.g. a time slot SL information from other terminal devices in the network, such as PSCCH and/or PSSCH, is received in the resource pool within the network.
  • the listening window is a period of time during which the terminal device acquires the resource occupancy status of other terminal devices through listening before sending information.
  • T 0 is configured or pre-configured by the network device, Determined by the terminal device according to Table 1.
  • the ⁇ SL in the table is related to the sub-carrier spacing (SCS) corresponding to the SL bandwidth part (BWP) of the terminal device, and the ⁇ SL can be understood as the SCS configuration parameter of the SL BWP.
  • SCS sub-carrier spacing
  • BWP SL bandwidth part
  • the terminal device can determine the parameters according to Table 1 and Table 2 Among them, Table 1 and Table 2 are predefined by the protocol. An understandable way is that the terminal device determines the transmission resource used for sending the sideline information by listening to the time-frequency resource set, and specifically refers to listening to the time-frequency resource set in the listening window in the time-frequency resource set to determine the transmission resource. Transmission resources for sending sideline information.
  • An SCI can schedule at least one sideline transmission, such as PSSCH transmission.
  • an SCI schedules 3 sideline transmissions.
  • the first sideline transmission is the initial transmission of data carried by a PSSCH, and the next two sideline transmissions are the data retransmission.
  • an SCI schedules 3 sideline transmissions, and these 3 sideline transmissions are all retransmissions of one data.
  • the SCI heard by the terminal device includes the time domain and/or frequency domain resource information of the scheduled sideline transmission, the resource reservation period indication (which may be carried by the resource reservation period field) reflecting the data service period, and Priority information (priority), etc.
  • the priority information may indicate the priority information corresponding to the scheduled PSSCH, and/or the priority information of the PSFCH associated with the scheduled PSSCH, the priority information indicates the priority value, the priority The value can be any of 1, 2, 3, 4, 5, 6, 7, and 8. That is, any terminal device can reserve one or more time-frequency resources in the future for sending new transmissions and/or retransmissions of the SL information to be sent by sending an SCI.
  • a terminal device listens to and decodes sidelink control information (SCI) sent by other terminal devices on PSCCH to learn the time-frequency resource reservation status of other terminal devices in the selection window of the terminal device , and then determine that within the selection window of the terminal device, for example, in the time slot [n+T 1 , n+T 2 ], the SL information is sent, where n+T 1 is the initial time slot number, and n+T 2 is the number of the initial time slot.
  • the end slot numbers, T1 and T2 are determined according to the data delay of the terminal device. In this way, the terminal avoids selecting time-frequency resources reserved by other terminal devices to send SL information within the selection window, so as to reduce resource collision and improve the reliability of SL information transmission.
  • the terminal device If the end device is in the listening window slot there is no listening on a certain time slot within the time slot, for example, the terminal device is in the transmitting state on the time slot, then due to half duplex (half duplex) reasons cannot be sent and received at the same time.
  • the terminal device according to the network equipment Configured or pre-configured or predefined resource reservation period information, after excluding the time slot, the reservation time domain resource determined according to the resource reservation period information is located in the resource selection window of the terminal device [n+T 1 , n+T 2 ] for all resources in the corresponding time slot.
  • FIG. 3 a schematic diagram of resource selection is shown.
  • the second terminal device performs SL transmission in the time slot m, so that it cannot listen on the time slot m, and according to the configured resource reservation period values P 1 and P 2 , the time slots m+P′ 1 and P 2 are excluded from the resource selection window.
  • Time slot m+P' 2 all resources on the two time slots, wherein P' 1 and P' 2 are the logical period values in the time-frequency resource set corresponding to P 1 and P 2 respectively.
  • the second terminal device also excludes the time-frequency resources reserved by other terminal devices within the selection window from the time-frequency resources that can be used to send the sideline information to be sent, that is, excludes the time-frequency resources that are not available.
  • the second terminal device is in the time slot
  • the SCI is received, and the SCI includes a resource reservation period (resource reservation period) field, which carries a resource reservation period indication, and the value of the resource reservation period indication is that the terminal device indicated by the resource reservation period information may be allowed in the resource pool.
  • a resource reservation period value in the set of resource reservation period values of the prio RX is the priority value of the PSSCH corresponding to the SCI. is the listening window within a time slot.
  • the RSRP measurement result determined by the second terminal device according to the SCI is higher than the threshold Th prioTX,prioRX , where the threshold Th prioTX,prioRX is the priority value indicated in the received SCI and the priority value corresponding to the data to be sent by the second terminal device. level value function.
  • the second terminal device is in the time slot
  • the reserved time-frequency resources determined by the received SCI overlap with the time-frequency resources in the selection window.
  • the second terminal device may determine that the remaining time-frequency resources in the resource selection window are available time-frequency resources, so as to select the available time-frequency resources for sending the pending time-frequency resources.
  • the resource selection window is a time period during which the terminal device selects resources for sideline information transmission. The resource selection window usually occurs later than the listening window in the time domain.
  • the number of times that the second terminal device listens within the listening window can be reduced, so as to save the power of the terminal device.
  • time slots Listening is performed on the time slots within the time slot n, and only a part of the time slots before time slot n (called partial listening) is performed, and the time-frequency resource for sending SL information is determined according to the result of the partial listening.
  • the second terminal device does not perform listening, and selects the time-frequency resource for sending the SL information in a random selection manner.
  • the second terminal device Due to the restriction of half-duplex, when the second terminal device is in the listening window and does not listen to a certain time slot, it cannot obtain the SCI information of other terminal devices in the time slot, that is, it cannot obtain the time slot. reservation information of other terminal devices on the slot, all possible periodic resources based on the reservation on the slot can only be excluded from the available resources within the resource selection window of the second terminal device. This easily leads to excessive exclusion, resulting in a reduction in available resources and a reduction in resource utilization, increasing the collision probability of resource selection between different terminal devices, and reducing transmission reliability. Further, since the second terminal device cannot know the reservation information of other terminal devices in the time slot, the listening result is also incomplete, which increases the collision probability with other terminal device resource selection and reduces transmission reliability.
  • an embodiment of the present application proposes a communication method, which can improve resource utilization.
  • an auxiliary terminal device is used to provide the listening result information that cannot be determined by the assisted terminal device itself, so as to assist the terminal device in resource selection, including excluding resources indicated as collisions from available resources, and retaining resources indicated as collisions. Resources without collisions are available resources.
  • the present application is applied in V2X, D2D and other systems where terminal devices communicate directly with terminal devices, and is suitable for communication scenarios with or without network coverage, where the terminal device autonomously selects the transmission mode of resources.
  • the terminal device may be within the coverage of the network device, or may be outside the coverage of the network device.
  • FIG. 4 a schematic diagram of a communication scenario to which the embodiment of the present application is applied is shown.
  • the two terminal devices that send sideline information and receive sideline information may both be within the coverage of the network equipment; among the two terminal devices that send sideline information and receive sideline information, one of the terminal devices may be within the coverage of the network equipment.
  • another terminal device may be outside the coverage area of the network equipment; the two terminal devices sending the sideline information and receiving the sideline information may both be outside the coverage area of the network equipment.
  • This application does not limit this.
  • FIG. 5 a schematic flow interaction diagram of a communication method proposed by an embodiment of the present application is shown.
  • the second terminal device sends the second sideline information in the first time slot.
  • the first time slot may refer to one time slot, or may refer to multiple time slots.
  • the first time slot is a time slot in the listening window of the second terminal device; the listening window is before the resource selection window for sending sideline information.
  • the first time slot includes at least one subchannel
  • the second terminal device may use at least one first subchannel in the first time slot to send second sideline information, wherein the at least one first subchannel belongs to at least one subchannel.
  • the first terminal device receives the first sideline information from the third terminal device in the first time slot. It can be understood that the third terminal device refers to other terminals except the first terminal and the second terminal. There may be one or more third terminal devices sending the first sideline information in the first time slot, and the first terminal device may receive at least one first time slot sent by at least one third terminal device in the first time slot. Side row information. Wherein, the first sideline information and the second sideline information may be PSCCH, or may be PSCCH and PSSCH.
  • the second terminal in this embodiment of the present application is a half-duplex device.
  • the first terminal device, the second terminal device and the third terminal device are terminal devices.
  • the first terminal device may be understood as an auxiliary terminal device, and the second terminal device may be understood as an assisted terminal device.
  • the first terminal device receives the second sideline information sent from the second terminal device in the first time slot; and determines the first sideline information according to the second sideline information received from the second terminal device in the first time slot.
  • the time slot is a time slot in which the second terminal device sends the second sideline information.
  • what the second terminal device sends in the first time slot is not the second sideline information, but sends uplink information to the network device in the first time slot, at this time, the first time slot is also the second terminal device
  • the time slot in which the information is sent, and the second terminal device will send the indication information to inform the first terminal device that the second terminal device has sent the uplink information to the network device on the first time slot, or the second terminal device will inform the first terminal device through the indication information.
  • the first time slot of the terminal device is a time slot in which the second terminal device transmits information.
  • the first terminal device listens in the first time slot, and receives at least one first sideline information sent by at least one third terminal device.
  • the first terminal device learns, according to the resource reservation period information in the sideline information sent by the second terminal device before the first time slot, that the second terminal device needs to send the second sideline information in the first time slot, that is, the second If the terminal device cannot listen in the first time slot, the first terminal device listens in the first time slot, and receives at least one first sideline information sent by at least one third terminal device.
  • the first terminal device listens to the SCI sent by other terminal devices except the first terminal device on each time slot, so the first time slot receives the SCI from the third terminal device in the first time slot.
  • the second sideline information sent by the second terminal device can be received at the same time as the first sideline information. It is not that the second terminal device sends the second sideline information to trigger the first terminal device to receive the first sideline information from the third terminal device. line information, nor is it that the third terminal device sends the first side line information to trigger the first terminal device to receive the second side line information from the second terminal device.
  • the first terminal device determines available time-frequency resources and/or unavailable time-frequency resources in the first time slot according to the first sideline information.
  • the first terminal device may only determine which time-frequency resources are available in the resource pool, or may only determine which time-frequency resources are unavailable in the resource pool, and may also determine which time-frequency resources are available and which time-frequency resources in the resource pool at the same time.
  • the available time-frequency resources may be resources whose detected signal strength is lower than a certain threshold, that is, such resources will be considered to be available without being occupied.
  • unavailable time-frequency resources may be detected as resources. A resource whose signal strength is higher than a certain threshold, that is, such a resource will be considered occupied and unavailable.
  • the first terminal device may determine, according to the at least one first sideline information received from at least one third terminal device, the remaining subchannels except the at least one first subchannel among all the subchannels of the first time slot. available time-frequency resources and/or unavailable time-frequency resources. It should be understood that if the second terminal device uses at least one first subchannel to send the second sideline information in the first time slot, the first terminal device may not care whether the at least one first subchannel is available to the second terminal device The time-frequency resources can be judged by the second terminal device by itself.
  • the first terminal device may determine, according to the first threshold, available time-frequency resources and/or unavailable time-frequency resources in the remaining subchannels in all subchannels of the first time slot except at least one first subchannel resource.
  • the remaining sub-channels except at least one first sub-channel among all the sub-channels of the first time slot may be referred to as second sub-channels, and the second sub-channel may be one or multiple.
  • the first threshold may be a threshold Th(pi, pi) determined by the first terminal device according to the priority information carried in the SCI sent by the second terminal device, or may be a threshold value Th(pi, pi) determined by the first terminal device according to network configuration or pre-configuration.
  • a threshold value Th(pi, pi) determined by the priority information for example, the value of the network configuration or the pre-configured priority information can be any one of 1, 2, 3, 4, 5, 6, 7, and 8.
  • the method for determining the threshold value by the priority information may be: Th(pi, pi) is a function value whose variables are pi and pi, where pi is the priority carried by the SCI sent by the third terminal device received value, pi is the priority value carried in the SCI sent by the second terminal device or the priority value configured or pre-configured by the network.
  • the first terminal device receives the first sideline information sent by the third terminal device using the second subchannel on the first time slot, and the first terminal device measures the reference signal on the second subchannel
  • the received power RSRP can be RSRP measurement performed for the demodulation reference signal (de-modulation reference signal, DMRS) of the PSSCH, and according to the comparison between the RSRP and the first threshold, it is determined whether the second subchannel is available. time-frequency resources. If the RSRP is greater than the first threshold, the first terminal device determines that the second subchannel is an unavailable time-frequency resource; if the RSRP is less than or equal to the first threshold, the first terminal device determines that the second subchannel is an available time-frequency resource .
  • DMRS demodulation reference signal
  • the first terminal device determines that the resource pool preconfigured by the network device includes 7 sub-channels, including sub-channel #1, sub-channel #2, sub-channel #3, sub-channel #4, sub-channel #5, and sub-channel #6 and subchannel #7, the first terminal device may listen on each subchannel on the first time slot.
  • the first terminal device receives the second sideline information sent by the second terminal device, and determines that the PSSCH sent by the second terminal device occupies 2 subchannels, that is, subchannel #3 and subchannel #4. Then the first terminal device only needs to determine available time-frequency resources and/or unavailable time-frequency resources in other subchannels except subchannel #3 and subchannel #4.
  • FIG. 6 a schematic diagram of resource selection according to an embodiment of the present application is shown.
  • the first terminal device receives the first sideline information sent by UE-1, determines that the PSSCH sent by UE-1 occupies sub-channel #6 and sub-channel #7, and measures the reference signal received power on sub-channel #6 and sub-channel #7 respectively RSRP, if the measured RSRPs are all greater than the first threshold, it is determined that subchannel #6 and subchannel #7 are unavailable time-frequency resources.
  • the first terminal device receives the first sideline information sent by UE-2, determines that UE-2 sends PSSCH to occupy subchannel #1, and measures RSRP on subchannel #1, where the RSRP is greater than the first threshold, and determines subchannel #1 1 is an unavailable time-frequency resource.
  • the first terminal device does not receive the first sideline information on subchannel #2 and subchannel #5, it determines that subchannel #2 and subchannel #5 are available time-frequency resources; or, the first terminal device is on subchannel #2
  • the first sideline information is received on subchannel #5, but the RSRP measured on subchannel #2 and subchannel #5 is less than or equal to the first threshold, then it is determined that subchannel #2 and subchannel #5 are available time-frequency resources .
  • the first sideline information is not received, it can also be understood that there is no other terminal device sending the first sideline information or the first sideline information sent by other terminal devices cannot be correctly decoded, and receiving the first sideline information can be understood as The decoding of the first side row information is successful.
  • UE-1 and UE-2 are third terminal devices.
  • the first terminal device determines subchannel #1, subchannel #6 and subchannel #7 as unavailable time-frequency resources, and determines subchannel #2 and subchannel #5 as available time-frequency resources. It can be understood that the unavailable time-frequency resources or the available time-frequency resources determined by the first terminal are for the second terminal device, because the second terminal device does not listen in the first time slot, and is the first terminal device. The device assists or assists the second terminal device to listen in the first time slot, and determines the unavailable time-frequency resources or the available time-frequency resources of the second terminal device within the selection window of the second terminal device.
  • the first terminal device receives the first sideline information sent by the third terminal device using the second subchannel on the first time slot, and the first terminal device measures the reference on the second subchannel The signal received power RSRP, and according to the RSRP, the first threshold and the resource reservation period included in the first sideline information, it is determined whether the second subchannel is an available time-frequency resource.
  • the first terminal device determines that the second subchannel is an unavailable time-frequency resource; if the RSRP is less than or equal to the first threshold, the first terminal device determines that the second subchannel is an unavailable time-frequency resource.
  • the subchannel is an available time-frequency resource; if the value of the resource reservation period indication included in the first sideline information is equal to zero, or, there is no resource reservation period indication in the first sideline information, the first terminal device determines that the second subchannel Channels are available time-frequency resources.
  • the first terminal device determines that the resource pool preconfigured by the network device includes 7 sub-channels, including sub-channel #1, sub-channel #2, sub-channel #3, sub-channel #4, sub-channel #5, and sub-channel #6 and subchannel #7, the first terminal device may listen on each subchannel on the first time slot.
  • the first terminal device receives the second sideline information sent by the second terminal device, and determines that the PSSCH sent by the second terminal device occupies 2 subchannels, that is, subchannel #3 and subchannel #4. Then the first terminal device only needs to determine available time-frequency resources and/or unavailable time-frequency resources in other subchannels except subchannel #3 and subchannel #4.
  • FIG. 7 another schematic diagram of resource selection according to an embodiment of the present application is shown.
  • the first terminal device receives the first sideline information sent by UE-1, determines that the PSSCH sent by UE-1 occupies sub-channel #6 and sub-channel #7, and measures the reference signal received power on sub-channel #6 and sub-channel #7 respectively RSRP, if the measured RSRP is greater than the first threshold, it means that sub-channel #6 and sub-channel #7 are occupied in the first time slot, and the value indicated by the resource reservation period included in the first sideline information is greater than zero, the explanation will give The future resource selection of the second terminal device causes a conflict, and the sub-channel #6 and the sub-channel #7 are determined to be unavailable time-frequency resources.
  • the first terminal device receives the first sideline information sent by UE-2, determines that UE-2 sends PSSCH to occupy sub-channel #1, and measures RSRP on sub-channel #1, where the RSRP is greater than the first threshold, and the first The value of the resource reservation period indication included in the sideline information is equal to zero, or, there is no resource reservation period indication in the first sideline information, indicating that although subchannel #1 is occupied in the first time slot, it will not be given to the second terminal. If the future resource selection of the device causes a conflict, the sub-channel #1 is determined to be an available time-frequency resource.
  • the first terminal device does not receive the first sideline information on subchannel #2 and subchannel #5, it determines that subchannel #2 and subchannel #5 are available time-frequency resources; or, the first terminal device is on subchannel #2
  • the first sideline information is received on subchannel #5, but the RSRP measured on subchannel #2 and subchannel #5 is less than or equal to the first threshold, regardless of the resource reservation cycle indication included in the first sideline information. If the value of is equal to zero or greater than zero, it will not bring conflict to the future resource selection of the second terminal device, and then it is determined that subchannel #2 and subchannel #5 are available time-frequency resources.
  • UE-1 and UE-2 are third terminal devices.
  • the first terminal device determines that subchannel #6 and subchannel #7 are unavailable time-frequency resources, and determines that subchannel #1, subchannel #2, and subchannel #5 are available time-frequency resources.
  • the first terminal device may determine available time-frequency resources and/or unavailable time-frequency resources in all subchannels in the first time slot according to the first sideline information and the second sideline information.
  • the first terminal device may determine, according to the first threshold, available time-frequency resources and/or unavailable time-frequency resources in the remaining subchannels in all subchannels of the first time slot except at least one first subchannel resource.
  • the first terminal device may determine available time-frequency resources and/or unavailable time-frequency resources in at least one first subchannel according to a second threshold, where the second threshold is greater than the first threshold.
  • the remaining sub-channels except at least one first sub-channel among all the sub-channels of the first time slot may be referred to as second sub-channels, and the second sub-channel may be one or multiple.
  • the second threshold first threshold+offset value
  • the first threshold value may be a threshold value determined by the first terminal device according to the priority information carried in the SCI sent by the second terminal device, or may be a threshold value determined by the first terminal device according to network configuration or preconfigured priority information.
  • the threshold value for example, can be any one of 1, 2, 3, 4, 5, 6, 7, and 8.
  • the second threshold may be configured by the network device, for example, through RRC signaling, or it may be pre-configured by the network device, or it may be configured by the first terminal device to the second terminal device, such as through PC-5 RRC signaling.
  • command, SCI information or may be configured by the second terminal device to the first terminal device; or may be determined according to priority information of the first terminal device and/or the second terminal device.
  • the specific process for the first terminal device to determine, according to the first threshold, available time-frequency resources and/or unavailable time-frequency resources in the remaining sub-channels of all sub-channels of the first time slot except at least one first sub-channel is the same. as described above.
  • the first terminal device receives the second sideline information sent by the second terminal device in the first time slot by using at least one first subchannel, and the first terminal device measures the reference information on the at least one first subchannel The signal received power RSRP, and according to the comparison between the RSRP and the second threshold, it is determined whether at least one first subchannel is an available time-frequency resource.
  • the RSRP is greater than the second threshold, it indicates that the sub-channel resources conflict, that is, more than one terminal device uses at least one first sub-channel to send sideline information in the first time slot, and the first terminal device determines that at least one first sub-channel is unavailable Time-frequency resources used; if the RSRP is less than or equal to the second threshold, it means that only the second terminal device uses at least one first subchannel to send sideline information in the first time slot, and the first terminal device determines that the at least one first subchannel Channels are available time-frequency resources.
  • the first terminal device determines that the resource pool preconfigured by the network device includes 7 sub-channels, including sub-channel #1, sub-channel #2, sub-channel #3, sub-channel #4, sub-channel #5, and sub-channel #6 and sub-channel #7, the first terminal device may listen to each sub-channel on the first time slot, and determine available time-frequency resources and/or unavailable time-frequency resources in the seven sub-channels in the first time slot.
  • the first terminal device receives the second sideline information sent by the second terminal device, and determines that the PSSCH sent by the second terminal device occupies 2 sub-channels, that is, sub-channel #3 and sub-channel #4, on sub-channel #3 and sub-channel #4, respectively.
  • the reference signal received power RSRP is measured, and the measured RSRP is greater than the second threshold, indicating that subchannel #3 and subchannel #4 conflict with resources, and it is determined that subchannel #3 and subchannel #4 are unavailable time-frequency resources.
  • the first terminal device receives the first sideline information sent by UE-1, determines that the PSSCH sent by UE-1 occupies sub-channel #6 and sub-channel #7, and measures the reference signal received power on sub-channel #6 and sub-channel #7 respectively RSRP, the measured RSRP is greater than the first threshold, and it is determined that subchannel #6 and subchannel #7 are unavailable time-frequency resources.
  • the first terminal device receives the first sideline information sent by UE-2, determines that UE-2 sends PSSCH to occupy subchannel #1, and measures RSRP on subchannel #1, where the RSRP is greater than the first threshold, and determines subchannel #1 1 is an unavailable time-frequency resource.
  • the first terminal device does not receive the first sideline information on subchannel #2 and subchannel #5, it determines that subchannel #2 and subchannel #5 are available time-frequency resources; or, the first terminal device is on subchannel #2
  • the first sideline information is received on subchannel #5, but the RSRP measured on subchannel #2 and subchannel #5 is less than or equal to the first threshold, then it is determined that subchannel #2 and subchannel #5 are available time-frequency resources .
  • UE-1 and UE-2 are third terminal devices. Therefore, the first terminal device determines that sub-channel #1, sub-channel #3, sub-channel #4, sub-channel #6 and sub-channel #7 are unavailable time-frequency resources, and determines that sub-channel #2 and sub-channel #5 are available time-frequency resources.
  • the first terminal device determines that the resource pool preconfigured by the network device includes 7 sub-channels, including sub-channel #1, sub-channel #2, sub-channel #3, sub-channel #4, sub-channel #5, and sub-channel # 6 and sub-channel #7, the first terminal device may listen to each sub-channel on the first time slot, and determine available time-frequency resources and/or unavailable time-frequency resources in the seven sub-channels in the first time slot.
  • the first terminal device receives the second sideline information sent by the second terminal device, and determines that the PSSCH sent by the second terminal device occupies 2 sub-channels, that is, sub-channel #3 and sub-channel #4, on sub-channel #3 and sub-channel #4, respectively.
  • the reference signal received power RSRP is measured, and the measured RSRP is greater than the second threshold, indicating that subchannel #3 and subchannel #4 conflict with resources, and it is determined that subchannel #3 and subchannel #4 are unavailable time-frequency resources.
  • the first terminal device receives the first sideline information sent by UE-1, determines that the PSSCH sent by UE-1 occupies sub-channel #6 and sub-channel #7, and measures the reference signal received power on sub-channel #6 and sub-channel #7 respectively RSRP, if the measured RSRP is greater than the first threshold, it means that sub-channel #6 and sub-channel #7 are occupied in the first time slot, and the value indicated by the resource reservation period included in the first sideline information is greater than zero, the explanation will give The future resource selection of the second terminal device causes a conflict, and the sub-channel #6 and the sub-channel #7 are determined to be unavailable time-frequency resources.
  • the first terminal device receives the first sideline information sent by UE-2, determines that UE-2 sends PSSCH to occupy sub-channel #1, and measures RSRP on sub-channel #1, where the RSRP is greater than the first threshold, and the first The value of the resource reservation period indication included in the sideline information is equal to zero, or, there is no resource reservation period indication in the first sideline information, indicating that although subchannel #1 is occupied in the first time slot, it will not be given to the second terminal. If the future resource selection of the device causes a conflict, the sub-channel #1 is determined to be an available time-frequency resource.
  • the first terminal device does not receive the first sideline information on subchannel #2 and subchannel #5, it determines that subchannel #2 and subchannel #5 are available time-frequency resources; or, the first terminal device is on subchannel #2
  • the first sideline information is received on subchannel #5, but the RSRP measured on subchannel #2 and subchannel #5 is less than or equal to the first threshold, regardless of the resource reservation cycle indication included in the first sideline information. If the value of is equal to zero or greater than zero, it will not bring conflict to the future resource selection of the second terminal device, and then it is determined that subchannel #2 and subchannel #5 are available time-frequency resources.
  • UE-1 and UE-2 are third terminal devices. Therefore, the first terminal device determines that sub-channel #3, sub-channel #4, sub-channel #6 and sub-channel #7 are unavailable time-frequency resources, and determines that sub-channel #1, sub-channel #2 and sub-channel #5 are available time-frequency resources.
  • the first terminal device receives the second sideline information sent by the second terminal device using at least one first subchannel in the first time slot, but the first terminal device cannot correct the second sideline information Decoding or decoding fails, it is considered that other terminal devices other than the second terminal device use the first sub-channel to send sideline information, indicating that the first sub-channel resource conflicts, then the first terminal device determines that at least one first sub-channel Subchannels are unavailable time-frequency resources.
  • the first terminal device may determine available time-frequency resources and/or unavailable time-frequency resources in all subchannels in the first time slot only according to the first sideline information.
  • the subchannel occupied by the at least one first sideline information sent by at least one third terminal device received by the first terminal device may conflict with the subchannel occupied by the second sideline information sent by the second terminal device. Therefore, the first The terminal device may also determine available time-frequency resources and/or unavailable time-frequency resources in all subchannels in the first time slot only according to the first sideline information.
  • the first terminal device may also determine available time-frequency resources and/or unavailable time-frequency resources in all subchannels in the first time slot only according to the second sideline information.
  • the first terminal device sends first indication information to the second terminal device, where the first indication information is used to indicate available time-frequency resources and/or unavailable time-frequency resources in the first time slot, in other words, the first indication information Used to indicate available subchannels and/or unavailable subchannels in the first slot.
  • the first indication information may be used to indicate available time-frequency resources in all subchannels of the first time slot, or may be used to indicate unavailable time-frequency resources in all subchannels of the first time slot, or It is used to indicate available time-frequency resources and unavailable time-frequency resources in all subchannels of the first time slot.
  • the first indication information may be used to indicate available time-frequency resources in the remaining subchannels except at least one of the first subchannels in all subchannels of the first time slot, or may be used to indicate the The unavailable time-frequency resources in the remaining sub-channels in all sub-channels except at least one first sub-channel can also be used to indicate the remaining sub-channels in all sub-channels in the first time slot except at least one first sub-channel available time-frequency resources and unavailable time-frequency resources.
  • the time-frequency resources may be embodied in one or more subchannels on the first time slot.
  • the first indication information may include N bits, where N is the number of sub-channels in the resource pool that can be used to send sideline information, or, is the number of sub-channels in the resource pool other than the first sub-channel , that is, the number of second sub-channels.
  • Each of the N bits may correspond to each subchannel in the resource pool, or each subchannel except the first subchannel in the resource pool, to indicate whether each subchannel is available. For example, when a bit takes a value of "1", it indicates that the sub-channel corresponding to this bit is unavailable; when a bit takes a value of "0", it indicates that the sub-channel corresponding to this bit is available; Be applicable.
  • the first terminal device may send the first indication information to the second terminal device on a physical sidelink feedback channel (physical sidelink feedback channel, PSFCH).
  • PSFCH physical sidelink feedback channel
  • the resource of the PSFCH bearing the first indication information may be provided by the resource pool configuration information.
  • the PSFCH resources are orthogonal, ie do not overlap.
  • one PSFCH resource includes one physical resource block (PRB), and the first terminal device may carry N bits of information by sending continuous or discrete N PSFCHs, that is, each PRB carries one bit information.
  • PRB physical resource block
  • one PSFCH resource includes N PRBs, and the first terminal device may carry N bits of information by sending the one PSFCH.
  • the one bit information may represent the value of the bit information as "1" or "0" in different cyclic shift (cyclic shift) manners of the sequence.
  • the time domain resource of the PSFCH used to carry the first indication information is after the first time slot, and the interval is not less than K time slots.
  • the value of K is a positive integer greater than or equal to 0, and K can be carried in the configuration information of the resource pool. , for example the value 2 or 3.
  • the first terminal device may not transmit, or specify to transmit a specific value, such as "1" or "0".
  • the second terminal device itself does not interpret and process the bit information by itself, because the second terminal device knows that it uses the subchannel corresponding to the bit information to transmit the PSSCH.
  • the resource pool includes 7 subchannels, it includes 7 bits of information to indicate whether each subchannel in the 7 subchannels is an available time-frequency resource, wherein the first bit information and the second bit information Corresponding to sub-channel #1 and sub-channel #2, a sequence with corresponding bit information values of "1" and "0" is sent; the first terminal device does not send the third bit information and the fourth bit information; the remaining bit information values are "0" or "1" is used to indicate whether the corresponding sub-channel #5, sub-channel #6 and sub-channel #7 are available.
  • the bit information may all be carried in the PSFCH resource, and the interval between the time domain resource of the PSFCH and the time slot m is greater than or equal to the configured K value, and the K value is 3 in FIG. 8 .
  • the PSFCH is only an example of carrying the first indication information, and the first indication information can also be carried in PSCCH or PSSCH, for example, can also be carried in the second-level SCI or MAC CE or PC5-RRC.
  • the second terminal device receives the first indication information from the first terminal device. Specifically, the second terminal device may receive the first indication information from the first terminal device on the physical sideline feedback channel PSFCH.
  • the second terminal device determines, according to the first indication information, a time-frequency resource for sending the third sideline information in the resource selection window. Specifically, according to the first indication information, the second terminal device excludes the reserved time-frequency resources determined according to the resource reservation period indication and is located in the unavailable time-frequency resources in the resource selection window, and sends the third sideline information according to the available time-frequency resources .
  • the time slot for sending the third side row information is a certain time slot after the first time slot.
  • the second terminal device may exclude the sub-channels indicated by the first indication information as unavailable on time slot m+P' 1 and time slot m+P' 2 in the resource selection window, and determine time slot m+P' 1 and time slot m+P' 2
  • the first indication information of m+P' 2 indicates that an available subchannel is an available time-frequency resource.
  • the second terminal device may exclude time slot m according to the actual value indicated in the resource reservation period included in the second information. +P'1 or at least one first subchannel on time slot m+ P'2 .
  • the second terminal device may also exclude the unavailable time-frequency resources according to the resources actually occupied by the second terminal device.
  • the second terminal device may only exclude the sub-channel indicated by the first indication information on the time slot m+P' 1 as unavailable.
  • the first indication information on the time slot m+P′ 1 indicates that the available subchannel is an available time-frequency resource; if the second terminal device only makes a reservation in the time slot m+P′ 2 , then the second terminal device Only the subchannels indicated by the first indication information on the time slot m+P' 2 as unavailable may be excluded, and the available subchannels indicated by the first indication information on the time slot m+P' 2 are available time-frequency resources.
  • the first indication information sent by the first terminal device indicates that the second terminal device sends at least one first subchannel of the second sideline information in the first time slot as an unavailable time-frequency resource, that is, the first terminal device determines that at least one first subchannel is an unavailable time-frequency resource. If the first subchannel is a conflicting time-frequency resource, or the first terminal device fails to decode the received second sideline information, the second terminal device may exclude time slot m+P' 1 and time slot m+P' 2 At least one of the first sub-channels, re-selecting available sub-channels to send third sideline information.
  • the second terminal device may use the first subchannel to send the information on time slot m+P′ 1 and time slot m+P′ 2 information on the third side row.
  • the second terminal device If the first indication information sent by the first terminal device indicates that the second terminal device sends at least one first subchannel of the second sidelink information in the first time slot as an unavailable time-frequency resource, and the second terminal device receives other Negative acknowledgment (negative acknowledgement, NACK) information for the second sideline information sent by the terminal device, the second terminal device does not use at least one of the first sub-slots in time slot m+P′ 1 and time slot m+P′ 2 The channel sends third sideline information.
  • NACK Negative acknowledgment
  • the terminal device In addition to the case where the terminal device does not listen to the time slot due to the half-duplex problem, it is also possible that the terminal device listens to a part of the time slot in a time period consisting of consecutive time slots for resource selection due to energy saving reasons. , including performing partial sensing (partial sensing) resource selection and configuring DRX (Discontinuous Reception) for discontinuous reception for resource selection.
  • DRX discontinuous Reception
  • the listening result cannot completely reflect the complete time-frequency resource reservation situation in the one time period, which will lead to the selection of The time-frequency resources selected in the window may collide with resources reserved by other terminal devices.
  • One solution is to select time slot m for the time-frequency resources of the SL information to be sent, and perform resource re-evaluation and preemption detection at time slot mT 3 by the terminal device, The value of is determined by Table 1.
  • re-evaluation and preemption detection are performed on the time-frequency resources used for sending the to-be-sent SL information, including at least listening to the time slot mT 3 , and determining the time-frequency resources received on the time slot mT 3 Whether the time-frequency resources indicated by the sideline control information overlap with the time-frequency resources used for sending the SL information to be sent on the time slot m: if they overlap, re-select the overlapping time-frequency resources (re-select) ; if there is no overlap, send the to-be-sent SL information on time slot m.
  • the terminal device may determine to perform re-evaluation and preemption detection at least on time slot mT3 according to some triggering conditions, so as to determine the time-frequency resource for sending the SL information to be sent on time slot m and perform reselection. That is, before sending the SL information to be sent, it is determined to perform re-evaluation and preemption detection on the time-frequency resources used for sending the SL information to be sent according to a trigger condition, where the trigger condition includes:
  • the terminal device determines to perform re-evaluation and preemption detection on the time-frequency resources used for sending the SL information to be sent according to feedback information received before sending the SL information to be sent, where the feedback information includes HARQ feedback information, and the The HARQ feedback information is used to indicate the reception status of the data sent before sending the SL information to be sent. For example, if the data is correctly received by the receiving terminal device of the data, an ACK feedback from the receiving terminal device is received; if the data is not correctly received by the receiving terminal device of the data, the NACK feedback from the terminal device is received.
  • the terminal device when the terminal device continuously receives N1 or more NACKs of NACK feedbacks within a period of time before sending the SL information to be sent, triggering a time-frequency response for sending the SL information to be sent Re-evaluation and preemption detection are performed on resources; or, when the terminal device has received N2 or more NACK feedbacks accumulatively within a period of time before sending the SL information to be sent, triggering the Re-evaluation and preemption detection are performed on the time-frequency resources of the sent SL information; wherein, the terminal device obtains N 1 and N 2 through the configuration information of the network-side device, or pre-configured, or pre-defined.
  • the period of time includes multiple consecutive time slots, and the number of the multiple time slots may be configured, pre-configured, or predefined by the network side device.
  • the number of HARQ feedback information received continuously or the number of HARQ feedback information received cumulatively can reflect the current channel interference level to a certain extent. If the sent data collides, then re-evaluation and preemption detection can be performed at this time to send the selected time-frequency resource collision in advance, trigger resource reselection, reduce collision, and improve the reliability of data transmission; conversely, when the channel interference level is lower, the The lower the probability of resource selection collision, the less re-evaluation and preemption detection are required considering the energy saving factor.
  • the terminal device may be a first terminal device, a second terminal device, or a third terminal device.
  • the second terminal device is scheduled by the network device to perform uplink transmission in at least one time slot within the listening window of the first terminal device. Due to the limitation of half-duplex, the second terminal device cannot communicate with the user. Listening in the time slot of uplink transmission. The first terminal device cannot correctly decode the uplink information sent by the second terminal device to the network device, and cannot determine that the time slot (the first time slot) of the uplink transmission is the time when the second terminal device cannot perform listening. slot, then the first indication information cannot be sent to the second terminal device for assisting the second terminal device in resource selection.
  • a solution is that, when the second terminal device receives the uplink scheduling information of the network device, the uplink scheduling information indicates the time slot where the uplink resource is located, and before the time slot where the uplink resource is located, the time slot where the uplink resource is located is The slot informs the first terminal device that the time slot in which the uplink resource is located is carried in the fourth sideline information.
  • the fourth sideline information may be sideline control information (SCI), or sideline MAC CE, or PC5-RRC signaling, that is, the first terminal device receives the fourth sideline sent by the second terminal device.
  • the first terminal device obtains the time slot used for uplink transmission, the first terminal device determines that the time slot used for uplink transmission is the first time slot, and then listens in the first time slot, and determines that the first time slot is available in the first time slot time-frequency resources and/or unavailable time-frequency resources, and send first indication information for determining the time-frequency resources for sending the third sideline information to the second terminal device.
  • the second terminal device may have multiple undetected time slots in one listening window, and the first terminal device may determine the first indication information by listening in multiple undetected time slots of the second terminal device, Alternatively, the first terminal device may determine multiple pieces of first indication information, and send the multiple pieces of first indication information to the second terminal apparatus, and then the second terminal apparatus may determine, according to the multiple pieces of first indication information, a resource selection window for sending. The time-frequency resource of the third sideline information.
  • the second terminal device sends the second sidelink information in the first time slot, so that it cannot monitor the time-frequency resources or reserved time-frequency resource information used by other terminal devices to send the sidelink information
  • the first terminal device can learn the time-frequency resources or reserved time-frequency resource information used by other terminal devices (including the second terminal device and/or at least one third terminal device) to send sideline information by listening in the first time slot. , and indicate the determined available time-frequency resources and/or unavailable time-frequency resources to the second terminal device through the first indication information, which can prevent the second terminal device from indicating the available periodic time-frequency resources based on the resource reservation period Excluding all of them increases the available time-frequency resources, thereby improving resource utilization.
  • the increase of available resources can reduce the collision probability of resource selection between different terminal devices, and can improve the reliability of transmission.
  • An embodiment of the present application proposes a communication apparatus 900, which may be applied to the first terminal apparatus in the embodiment of the method in FIG. 5, or may be a component that implements the method in the embodiment of FIG. 5, such as a chip.
  • FIG. 9 a schematic block diagram of a communication apparatus 900 according to an embodiment of the present application is shown.
  • the communication device 900 includes:
  • a transceiver unit 910 configured to receive the first sideline information from the third terminal device in the first time slot
  • a processing unit 920 configured to determine available time-frequency resources and/or unavailable time-frequency resources in the first time slot according to the first sideline information
  • the transceiver unit 910 is further configured to send first indication information to the second terminal device, where the first indication information is used to indicate available time-frequency resources and/or unavailable time-frequency resources in the first time slot , the first time slot is a time slot in which the second terminal device sends the second sideline information.
  • the transceiver unit may be a sending unit when performing the sending step, and may be a receiving unit when performing the receiving step.
  • the transceiver unit may be replaced by a transceiver, the sending unit may be replaced by a transmitter, and the receiving unit may be receiver instead.
  • the transceiver unit 910 is further configured to receive the second sideline information from the second terminal device on the first time slot;
  • the processing unit 920 is further configured to, according to the second sideline information received from the second terminal device on the first time slot, determine that the first time slot is the one sent by the second terminal device. the time slot of the second sideline information.
  • the first time slot is located in the listening window of the second terminal device.
  • the first time slot includes at least one subchannel, and at least one first subchannel in the first time slot is used for the second terminal device to send the second sideline information, the At least one first subchannel belongs to the at least one subchannel.
  • the processing unit 920 is specifically configured to: determine, according to the first sideline information and/or the second sideline information, the available time-frequency resources and /or unavailable time-frequency resources; or, according to the first sideline information, determining available time in the remaining subchannels except the at least one first subchannel in all subchannels of the first time slot frequency resources and/or unavailable time-frequency resources.
  • the first indication information is used to indicate available time-frequency resources and/or unavailable time-frequency resources in all subchannels of the first time slot;
  • the first indication information is used to indicate available time-frequency resources and/or unavailable time-frequency resources in the remaining subchannels except the at least one first subchannel in all subchannels of the first time slot.
  • processing unit 920 is specifically configured to:
  • Available time-frequency resources and/or unavailable time-frequency resources in the at least one first subchannel are determined according to a second threshold, the second threshold being greater than the first threshold.
  • the transceiver unit 910 is further configured to send the first indication information to the second terminal device on a physical sideline feedback channel.
  • This embodiment of the present application proposes another communication apparatus 1000, which may be applied to the second terminal apparatus in the embodiment of the method in FIG. 5, or may be a component that implements the method in the embodiment of FIG. 5, such as a chip.
  • FIG. 10 a schematic block diagram of a communication apparatus 1000 according to an embodiment of the present application is shown.
  • the communication device 1000 includes:
  • a transceiver unit 1010 configured to send the second sideline information to the first terminal device in the first time slot
  • the transceiver unit 1010 is further configured to receive first indication information from the first terminal device, where the first indication information is used to indicate available time-frequency resources and/or unavailable time-frequency resources in the first time slot.
  • Time-frequency resources, wherein the available time-frequency resources and/or the unavailable time-frequency resources in the first time slot are obtained by the first terminal device according to the information received from the third terminal device in the first time slot.
  • the first sideline information is determined;
  • the processing unit 1020 is configured to determine, according to the first indication information, a time-frequency resource for sending the third sideline information.
  • the first time slot is located in the listening window of the second terminal device.
  • the first time slot includes at least one subchannel
  • the second terminal device sends the second side to the first terminal device in at least one first subchannel of the first time slot row information, the at least one first subchannel belongs to the at least one subchannel.
  • the first indication information is used to indicate available time-frequency resources and/or unavailable time-frequency resources in all subchannels of the first time slot;
  • the first indication information is used to indicate available time-frequency resources and/or unavailable time-frequency resources in the remaining subchannels except the at least one first subchannel in all subchannels of the first time slot.
  • available time-frequency resources and/or unavailable time-frequency resources in the remaining subchannels except the at least one first subchannel in all subchannels of the first time slot are determined according to a first threshold. of;
  • the available time-frequency resources and/or the unavailable time-frequency resources in the at least one first subchannel are determined according to a second threshold, and the second threshold is greater than the first threshold.
  • the transceiver unit 1010 is further configured to receive the first indication information from the first terminal device on a physical sideline feedback channel.
  • An embodiment of the present application proposes a communication apparatus 1100.
  • FIG. 11 a schematic block diagram of another communication apparatus according to an embodiment of the present application is shown.
  • the communication device 1100 includes a processor 1110, the processor 1110 is coupled with at least one memory 1120, and the processor 1110 is configured to read a computer program stored in the at least one memory 1120, so as to execute any of the embodiments of the present application methods in possible implementations.
  • the above-mentioned processor 1110 may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above method embodiments may be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or any other available processor. Programming logic devices, discrete gate or transistor logic devices, discrete hardware components.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • Programming logic devices, discrete gate or transistor logic devices, discrete hardware components discrete hardware components.
  • a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • the steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor.
  • the software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art.
  • the storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware.
  • the memory 1120 described above may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memory.
  • the non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • Volatile memory may be random access memory (RAM), which acts as an external cache.
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • SDRAM synchronous DRAM
  • SDRAM double data rate synchronous dynamic random access memory
  • double data rate SDRAM double data rate SDRAM
  • DDR SDRAM enhanced synchronous dynamic random access memory
  • ESDRAM enhanced synchronous dynamic random access memory
  • SCRAM synchronous link dynamic random access memory
  • direct rambus RAM direct rambus RAM
  • the embodiments of the present application provide a communication chip, including a processor and a communication interface, where the processor is configured to read an instruction or a computer program to execute the method in the embodiments of the present application.
  • An embodiment of the present application provides a communication system 1200, including a first terminal device 1210 and a second terminal device 1220 in the communication method provided by the embodiment of the present application.
  • a schematic block diagram of a communication system 1200 according to an embodiment of the present application is shown.
  • the embodiments of the present application further provide a computer-readable storage medium on which a computer program for implementing the methods in the embodiments of the present application is stored.
  • the computer program runs on a computer, the computer can implement the methods in the above method embodiments.
  • the embodiments of the present application also provide a computer program product, which, when running on a computer, enables the computer to execute the methods in the embodiments of the present application.
  • the size of the sequence numbers of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its functions and internal logic, and should not be used in the embodiments of the present application. implementation constitutes any limitation.
  • the term "and/or” in this application is only an association relationship to describe associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, it can mean that A exists alone, and A and B exist at the same time , there are three cases of B alone.
  • the character "/" in this document generally indicates that the contextual object is an "or” relationship; the term “at least one” in this application can mean “one” and "two or more", for example, A At least one of , B and C can mean: A alone exists, B exists alone, C exists alone, A and B exist simultaneously, A and C exist simultaneously, C and B exist simultaneously, and A and B and C exist simultaneously. seven situations.
  • the disclosed system, apparatus and method may be implemented in other manners.
  • the apparatus embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium.
  • the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution.
  • the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

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Abstract

本申请提供了一种通信方法、终端装置及系统，适用于V2X、智能驾驶、智能网联车等领域，能够提高资源利用率。该方法包括：第一终端装置在第一时隙上接收来自第三终端装置的第一侧行信息；所述第一终端装置根据所述第一侧行信息确定所述第一时隙中可用的时频资源和/或不可用的时频资源；所述第一终端装置向第二终端装置发送第一指示信息，所述第一指示信息用于指示所述第一时隙中可用的时频资源和/或不可用的时频资源，所述第一时隙为所述第二终端装置发送第二侧行信息的时隙。

Description

一种通信方法、终端装置及系统 技术领域
本申请涉及通信领域，并且更具体地，涉及一种通信方法、终端装置及系统。
背景技术
车与任何事物(vehicle-to-everything，V2X)通信是指车辆与外界的任何事物的通信，包括车与车的通信(vehicle to vehicle，V2V)、车与行人的通信(vehicle to pedestrian，V2P)、车与基础设施的通信(vehicle to infrastructure，V2I)、车与网络的通信(vehicle to network，V2N)。
V2X通信针对以车辆为代表的高速设备，是未来对通信时延要求非常高的场景下应用的基础技术和关键技术，如智能汽车、自动驾驶、智能交通运输系统等场景。V2X通信可以支持有网络覆盖和无网络覆盖的通信场景，其资源分配方式包括基于网络分配V2X传输资源的方式和终端自主选择V2X传输资源的方式。
在终端自主选择V2X传输资源的方式中，为了保证可靠性，发送终端通过进行侦听(sensing)来进行资源选择，在侦听窗内的资源池内接收来自其它终端发送的侧行信息。如果该发送终端在侦听窗内的某个时隙上无法或没有侦听，即无法获知该时隙上其他终端的资源占用情况，例如该发送终端在该时隙上处于发送状态，则由于半双工原因不能同时发送和接收，此时，该发送终端根据配置的或预配置的或预定义的资源预约周期信息，排除该时隙经过若干该资源预约周期而位于发送终端的资源选择窗内的相应时隙内的所有资源，这些被排除的资源将无法用于发送终端发送信息给其它终端。这样容易导致过度排除资源，使可用资源减少，资源利用率降低。
发明内容
本申请提供一种通信方法、终端装置及系统，能够提高资源利用率。
V2X通信中，车辆在行驶过程中会遇到很多突发交通状况，例如，某一车辆在高速公路上因发动机损坏而停在了快车道上，此车辆(即，发送终端)会将此停车信息在第一时隙发送给其周边的其它车辆，然后，发送终端未按规定布置警示牌，导致其后方行驶车辆与其相撞，发送终端需要将相撞信息发送给其周边的其它车辆。
由于半双工的限制，发送终端在侦听窗中其发送停车信息的第一时隙上无法接收来自其它车辆的信号，因此也就无法对此第一时隙上的资源占用情况进行评估，现有技术采用了最保守的办法，即对于因上述半双工限制导致的无法评估的资源全部排除。而本申请实施例中，利用辅助终端代替发送终端在第一时隙上进行资源占用情况的评估，并将评估结果指示给发送终端，而发送终端将根据辅助终端指示的评估结果，来确定第一时隙中哪些资源可用于发送终端确定发送相撞信息的资源，而不再是全部排除，提高了资源利用率。
第一方面，提供了一种通信方法，该方法由第一终端装置执行。其中，第一终端装置 可以为第一终端设备或第一终端设备中的部件，第一终端设备可以为V2X通信中的辅助终端，例如，可以为在发送终端无法进行资源评估时而代替发送终端进行资源评估的车辆，或者可以为路边单元(Road Side Unit，RSU)，而第一终端设备中的部件例如可以为装载于辅助终端中的处理器、车载通信模组、芯片或芯片系统等。
该方法包括：第一终端装置在第一时隙上接收来自第三终端装置的第一侧行信息；所述第一终端装置根据所述第一侧行信息确定所述第一时隙中可用的时频资源和/或不可用的时频资源；所述第一终端装置向第二终端装置发送第一指示信息，所述第一指示信息用于指示所述第一时隙中可用的时频资源和/或不可用的时频资源，所述第一时隙为所述第二终端装置发送第二侧行信息的时隙。
基于上述技术方案，第二终端装置在第一时隙发送第二侧行信息导致无法侦听其他终端装置发送侧行信息使用的时频资源或预约的时频资源信息，第一终端装置在该第一时隙通过侦听可以获知其他终端装置发送侧行信息使用的时频资源或预约的时频资源信息，并将确定的可用的时频资源和/或不可用的时频资源通过第一指示信息指示给第二终端装置，可以避免第二终端装置基于资源预约周期信息将可用的周期性时频资源全部排除，使可用的时频资源增加，从而提高资源利用率。
例如，在高速公路上发生碰撞的车辆接收其周围的辅助车辆发送的第一指示信息，第一指示信息指示了发生碰撞车辆由于发送停车信息而无法进行资源评估的第一时隙上的由辅助车辆获得的资源评估结果，发生碰撞车辆在确定发送碰撞信息的资源时会根据此第一指示信息考虑第一时隙中可用的时频资源和/或不可用的时频资源，而不是将第一时隙对应的资源全部排除，由此，提高了资源利用率。
在一种可能的设计中，所述方法还包括：所述第一终端装置在所述第一时隙上接收来自所述第二终端装置的所述第二侧行信息；所述第一终端装置根据在所述第一时隙上接收来自所述第二终端装置的所述第二侧行信息确定所述第一时隙为所述第二终端装置发送所述第二侧行信息的时隙。
采用该设计，第一终端装置可以判断出哪些时隙是第二终端装置发送信息的时隙，可对第二终端装置进行更有针对性的资源辅助，提高资源利用率的同时，可以进一步提高可靠性。
例如，辅助车辆可以确定哪些时隙是发生碰撞车辆发送信息的时隙，进而在此时隙上代替发生碰撞的车辆进行资源评估。
在一种可能的设计中，所述第一时隙位于所述第二终端装置的侦听窗中。
在一种可能的设计中，所述第一时隙中包括至少一个子信道，所述第一时隙中的至少一个第一子信道用于所述第二终端装置发送所述第二侧行信息，所述至少一个第一子信道属于所述至少一个子信道。
在一种可能的设计中，所述第一终端装置根据所述第一侧行信息确定所述第一时隙中可用的时频资源和/或不可用的时频资源，包括：所述第一终端装置根据所述第一侧行信息和/或所述第二侧行信息，确定所述第一时隙的所有子信道中可用的时频资源和/或不可用的时频资源；或，所述第一终端装置根据所述第一侧行信息，确定所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。
在一种可能的设计中，所述第一指示信息用于指示所述第一时隙的所有子信道中可用的时频资源和/或不可用的时频资源；或，所述第一指示信息用于指示所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。
在一种可能的设计中，所述第一终端装置根据第一阈值，确定所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源；所述第一终端装置根据第二阈值，确定所述至少一个第一子信道中可用的时频资源和/或不可用的时频资源，所述第二阈值大于所述第一阈值。
采用该设计，由于第二阈值大于第一阈值，在所述至少一个第一子信道中相比于所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中，更加容易确定出可用资源，进一步提高了资源利用率。
在一种可能的设计中，所述第一终端装置在物理侧行反馈信道上向所述第二终端装置发送所述第一指示信息。
第二方面，提供了一种通信方法，该方法由第二终端装置执行。其中，第二终端装置包括第二终端设备或第二终端设备中的部件，第二终端设备可以为V2X通信中的数据发送端，例如可以为在行驶过程中遇到突发交通事故而需要将此事故的相关信息发送给其它车辆的发送端车辆，或者可以为检测到了此突发交通事故的路边单元(Road Side Unit，RSU)，而第二终端设备中的部件例如可以为装载于发送端车辆中的处理器、车载通信模组、芯片或芯片系统等。
该方法包括：第二终端装置在第一时隙向第一终端装置发送第二侧行信息；所述第二终端装置接收来自所述第一终端装置的第一指示信息，所述第一指示信息用于指示所述第一时隙中可用的时频资源和/或不可用的时频资源，其中，所述第一时隙中可用的时频资源和/或不可用的时频资源是所述第一终端装置根据在所述第一时隙接收的来自第三终端装置的第一侧行信息确定的；所述第二终端装置根据所述第一指示信息，确定发送第三侧行信息的时频资源。
基于上述技术方案，第二终端装置在第一时隙发送第二侧行信息导致无法侦听其他终端装置发送侧行信息使用的时频资源或预约的时频资源信息，第一终端装置在该第一时隙通过侦听可以获知其他终端装置发送侧行信息使用的时频资源或预约的时频资源信息，并将确定的可用的时频资源和/或不可用的时频资源通过第一指示信息指示给第二终端装置，可以避免第二终端装置基于资源预约周期信息将可用的周期性时频资源全部排除，使可用的时频资源增加，从而提高资源利用率。
例如，在高速公路上发生碰撞的车辆接收其周围的辅助车辆发送的第一指示信息，第一指示信息指示了发生碰撞车辆由于发送停车信息而无法进行资源评估的第一时隙上的由辅助车辆获得的资源评估结果，发生碰撞车辆在确定发送碰撞信息的资源时会根据此第一指示信息考虑第一时隙中可用的时频资源和/或不可用的时频资源，而不是将第一时隙对应的资源全部排除，由此，提高了资源利用率。
在一种可能的设计中，所述第一时隙位于所述第二终端装置的侦听窗中。
在一种可能的设计中，所述第一时隙中包括至少一个子信道，所述第二终端装置在所述第一时隙的至少一个第一子信道向所述第一终端装置发送所述第二侧行信息，所述至少 一个第一子信道属于所述至少一个子信道。
在一种可能的设计中，所述第一指示信息用于指示所述第一时隙的所有子信道中可用的时频资源和/或不可用的时频资源；或，所述第一指示信息用于指示所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。
在一种可能的设计中，所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源是根据第一阈值确定的；所述至少一个第一子信道中可用的时频资源和/或不可用的时频资源是根据第二阈值确定的，所述第二阈值大于所述第一阈值。
采用该设计，由于第二阈值大于第一阈值，在所述至少一个第一子信道中相比于所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中，更加容易确定出可用资源，进一步提高了资源利用率。
在一种可能的设计中，所述第二终端装置在物理侧行反馈信道上接收来自所述第一终端装置的所述第一指示信息。
第三方面，提供了一种第一终端装置，此第一终端装置可执行第一方面提供的方法，第一终端装置具体包括：收发单元，用于在第一时隙接收来自第三终端装置的第一侧行信息；处理单元，用于根据所述第一侧行信息确定所述第一时隙中可用的时频资源和/或不可用的时频资源；所述收发单元还用于，向第二终端装置发送第一指示信息，所述第一指示信息用于指示所述第一时隙中可用的时频资源和/或不可用的时频资源，所述第一时隙为所述第二终端装置发送第二侧行信息的时隙。
在一种可能的设计中，所述收发单元还用于，在所述第一时隙上接收来自所述第二终端装置的所述第二侧行信息；所述处理单元还用于，根据在所述第一时隙上接收来自所述第二终端装置的所述第二侧行信息确定所述第一时隙为所述第二终端装置发送所述第二侧行信息的时隙。
在一种可能的设计中，所述第一时隙位于所述第二终端装置的侦听窗中。
在一种可能的设计中，所述第一时隙中包括至少一个子信道，所述第一时隙中的至少一个第一子信道用于所述第二终端装置发送所述第二侧行信息，所述至少一个第一子信道属于所述至少一个子信道。
在一种可能的设计中，所述处理单元具体用于：根据所述第一侧行信息和/或所述第二侧行信息，确定所述第一时隙的所有子信道中可用的时频资源和/或不可用的时频资源；或，根据所述第一侧行信息，确定所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。
在一种可能的设计中，所述第一指示信息用于指示所述第一时隙的所有子信道中可用的时频资源和/或不可用的时频资源；或，所述第一指示信息用于指示所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。
在一种可能的设计中，所述处理单元具体用于：根据第一阈值，确定所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源；根据第二阈值，确定所述至少一个第一子信道中可用的时频资源和/或不可 用的时频资源，所述第二阈值大于所述第一阈值。
在一种可能的设计中，所述收发单元还用于，在物理侧行反馈信道上向所述第二终端装置发送所述第一指示信息。
第四方面，提供了一种第二终端装置，此第二终端装置可执行第二方面提供的方法，第二终端装置具体包括：收发单元，用于在第一时隙向第一终端装置发送第二侧行信息；所述收发单元还用于，接收来自所述第一终端装置的第一指示信息，所述第一指示信息用于指示所述第一时隙中可用的时频资源和/或不可用的时频资源，其中，所述第一时隙中可用的时频资源和/或不可用的时频资源是所述第一终端装置根据在所述第一时隙接收的来自第三终端装置的第一侧行信息确定的；处理单元，用于根据所述第一指示信息，确定发送第三侧行信息的时频资源。
在一种可能的设计中，所述第一时隙位于所述第二终端装置的侦听窗中。
在一种可能的设计中，所述第一时隙中包括至少一个子信道，所述第二终端装置在所述第一时隙的至少一个第一子信道向所述第一终端装置发送所述第二侧行信息，所述至少一个第一子信道属于所述至少一个子信道。
在一种可能的设计中，所述第一指示信息用于指示所述第一时隙的所有子信道中可用的时频资源和/或不可用的时频资源；或，所述第一指示信息用于指示所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。
在一种可能的设计中，所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源是根据第一阈值确定的；所述至少一个第一子信道中可用的时频资源和/或不可用的时频资源是根据第二阈值确定的，所述第二阈值大于所述第一阈值。
在一种可能的设计中，所述收发单元还用于，在物理侧行反馈信道上接收来自所述第一终端装置的所述第一指示信息。
第五方面，提供了一种通信装置，包括：处理器，所述处理器与至少一个存储器耦合，所述处理器用于读取所述至少一个存储器所存储的计算机程序，以执行以上第一方面或第一方面的任意可能的设计中的方法，或执行以上第二方面或第二方面的任意可能的设计中的方法。
第六方面，提供了一种计算机可读存储介质，所述计算机可读介质存储有计算机程序；所述计算机程序在计算机上运行时，使得计算机执行第一方面或第二方面任意可能的设计中的方法。
第七方面，提供一种计算机程序产品，当其在计算机上运行时，使得该计算机执行上述第一方面至第二方面或其任意一种可能的设计中中所述的方法。
第八方面，提供了一种芯片，包括：处理器和通信接口，所述处理器用于读取指令或计算机程序以执行上述第一方面或第二方面的任一种可能的设计中的方法。
第九方面，提供了一种通信系统，包括第一方面所述方法中的第一终端装置，以及包括第二方面所述方法中的第二的终端装置。
以上第三方面至第九方面及其可能的设计的有益效果可参照第一或第二方面及其可能的设计中的有益效果。
附图说明
图1是车辆与外界事物通信的示意图。
图2是本申请实施例的时域单元逻辑示意图。
图3是一种资源选择示意图。
图4是本申请实施例适用的通信场景示意图。
图5是本申请实施例的一种通信的方法的示意性流程交互图。
图6是本申请实施例的一种资源选择示意图。
图7是本申请实施例的另一种资源选择示意图。
图8是本申请实施例的第一指示信息发送的示意图。
图9是本申请实施例的一种通信装置的示意性框图。
图10是本申请实施例的另一种通信装置的示意性框图。
图11是本申请实施例的另一种通信装置的示意性框图。
图12是本申请实施例的一种通信系统的示意性框图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
以下，对本申请实施例中的部分用语进行解释说明，以便于本领域技术人员理解。
1)终端装置，例如是终端设备，或者是用于实现终端设备的功能的模块，例如芯片系统，该芯片系统可以设置在终端设备中。终端设备包括向用户提供语音和/或数据连通性的设备，具体的，包括向用户提供语音的设备，或包括向用户提供数据连通性的设备，或包括向用户提供语音和数据连通性的设备。例如可以包括具有无线连接功能的手持式设备、或连接到无线调制解调器的处理设备。该终端设备可以经无线接入网(radio access network，RAN)与核心网进行通信，与RAN交换语音或数据，或与RAN交互语音和数据。该终端设备可以包括用户设备(user equipment，UE)、无线终端设备、移动终端设备、设备到设备通信(device-to-device，D2D)终端设备、V2X终端设备、机器到机器/机器类通信(machine-to-machine/machine-type communications，M2M/MTC)终端设备、物联网(internet of things，IoT)终端设备。最典型的，终端装置可以为车辆或终端型路边单元，或内置于车辆或路边单元的通信模块或芯片。如图1所示，出示了车辆与外界事物通信的示意图。
本申请实施例中，终端设备之间支持直接通信(PC5)接口通信，即支持通过侧行链路进行传输。
作为示例而非限定，在本申请实施例中，该终端设备还可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备或智能穿戴式设备等，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合 使用，如各类进行体征监测的智能手环、智能头盔、智能首饰等。
而如上介绍的各种终端设备，如果位于车辆上(例如放置在车辆内或安装在车辆内)，都可以认为是车载终端设备，车载终端设备例如也称为车载单元(on-board unit，OBU)。
本申请实施例中，终端设备还可以包括中继(relay)。或者理解为，能够与基站进行数据通信的都可以看作终端设备。
2)网络设备，例如包括接入网(access network，AN)设备，例如基站(例如，接入点)，可以是指接入网中在空口通过一个或多个小区与无线终端设备通信的设备，或者例如，一种V2X技术中的网络设备为路侧单元(road side unit，RSU)。RSU可以是支持V2X应用的固定基础设施实体，可以与支持V2X应用的其他实体交换消息。网络设备可以包括第五代移动通信技术(the 5th generation，5G)新空口(new radio，NR)系统(也简称为NR系统)中的下一代节点B(next generation node B，gNB)，或者也可以包括云接入网(cloud radio access network，Cloud RAN)系统中的集中式单元(centralized unit，CU)和分布式单元(distributed unit，DU)，本申请实施例并不限定。
3)侧行通信传输模式。终端装置和终端装置之间进行侧行通信，拥有两种传输模式，分别为受网络设备调度模式(通常称为传输模式1，Transmission Mode 1)和用户自主资源选择模式(通常称为传输模式2,Transmission Mode 2)。
在网络覆盖范围下，终端装置通过接收网络设备的系统消息块(system information block，SIB)、小区级(cell-specific)的无线资源控制(radio resource control，RRC)信令或者终端装置用户级(UE-specific)RRC信令获得SL资源池(resource pool)配置信息。终端装置也可以使用设备出厂预配置的SL资源池配置信息，例如，在没有网络覆盖范围时。SL资源池配置信息用于指示SL资源池，资源池是时频资源的集合用于UE之间进行侧行通信。资源池可以包括码域资源。资源池的资源用于包括终端装置发送和接收以下至少一种物理信道的资源，如PSCCH，PSSCH，PSDCH，PSFCH，PSBCH等，PSSCH所承载的业务类型可以包括单播、组播和/或广播通信类型。
在SL资源池的时域上，包括一个或多个时间单元，时间单元可以为一个符号、若干个符号、一个时隙、一个子帧，一个帧等，一个或多个时间单元可以是在时间上连续的，也可以是离散的；在SL资源池的频域上，包括一个或多个频域单元，频域单元可以是一个资源元素(resource element，RE)，若干个RE，一个资源块(resource block，RB)、若干个RB、一个子信道(sub channel)、若干个子信道，一个子信道包括一个或多个在频域上连续的或非连续RB。本申请中，除非特殊说明时间单元的含义，均用时隙进行描述，但不限于时间单位只为时隙；除非特殊说明时频域单元的含义，均用子信道进行描述，但不限于频域单位只为子信道。
一个资源池内所包含的时隙是逻辑上连续的，这些时隙称为逻辑时隙。如图2所示，出示了逻辑时隙示意图，其中时隙1至时隙8在时间上是连续的时隙，称这些时隙为物理时隙(physical slot)。一个资源池，被配置在时域包括时隙1，时隙3，时隙5和时隙8，尽管在时间上，这些时隙没有全部连续，但从该资源池的角度而言，其所包括这些时隙是相对连续的，称这些时隙称为逻辑时隙。时隙1’,时隙2’,时隙3’和时隙4’分别是物理时隙1，物理时隙3，物理时隙5和物理时隙8在该资源池的所对应的逻辑时隙。资源池配置信息中还包括资源预约周期(resource reservation period)信息，该资源预约周期信息可以指示一组 资源预约周期值{P 1,P 2,P 3,…,P i}，i为大于等于1的正整数，例如，该一组取值包含16个不同资源预约周期值值,{P 1,P 2,P 3,…,P 16}。该资源预约周期值的取值可以是0至99中任一整数值，或者100，200，300，…，1000等，单位可以为毫秒或时隙。所述{P 1,P 2,P 3,…,P i}为物理时间。在一个资源池，{P 1,P 2,P 3,…,P i}所对应的逻辑资源预约周期值值为{P′ 1,P′ 2,P′ 3,…,P′ i}，{P′ 1,P′ 2,P′ 3,…,P′ i}的单位可以为时隙。可以理解的，当一个资源池包括在时间上连续的时隙，即该资源池在物理时间上是连续的，那么该资源池的逻辑时隙和物理时隙是相等的。该资源预约周期值信息用于指示终端装置在该资源池中可能允许的资源预约周期值集合，即终端装置使用资源预留周期集合中的某一个资源预约周期值用来周期性地发送SL信息。在自主资源选择传输模式中，终端装置通过进行侦听(sensing)来确定资源选择，具体地，基于侦听确定资源选择的方法包括，
一个终端装置在时隙n时刻产生待发送的SL信息，SL信息包括物理层侧行链路共享信道(physical sidelink shared channel，PSSCH)、物理层侧行链路控制信道(physical sidelink control channel，PSCCH)、物理层广播控制信道(physical broadcast control channel，PSBCH)、物理层侧行链路反馈信道(physical sidelink feedback channel，PSFCH)和物理层下行链路控制信道(physical downlink control channel,PDCCH)中的至少一种。
在一种示例中，终端装置通过侦听时频资源集确定用于发送侧行信息的传输资源的方法可以包括：
终端装置在时隙n时刻触发资源选择过程，确定用于发送待发送的SL信息的时频资源。SL信息包括物理层侧行链路共享信道(physical sidelink shared channel，PSSCH)，物理层侧行链路控制信道(physical sidelink control channel，PSCCH)，物理层广播控制信道(physical broadcast control channel，PSBCH)，物理层侧行链路反馈信道(physical sidelink feedback channel，PSFCH)，和物理层侧行链路数据信道(physical sidelink data channel，PSDCH)中的至少一种。PSSCH承载的业务类型可以包括单播、组播和/或广播通信类型。
应理解，本申请中的表达式[A,B]表示包含边界点A和B的取值范围，表达式(A,B)表示同时不包含边界点A和B的取值范围。同理地，表达式[A,B)表示包含边界点A且不包含边界点B的取值范围，表达式(A,B]表示不包含边界点A且包含边界点B的取值范围。全文其他地方对此不再赘述。
终端装置在侦听窗内，比如，时隙
Figure PCTCN2021072278-appb-000001
内的资源池内接收来自网络中其他终端装置的SL信息，比如，PSCCH和/或PSSCH。侦听窗，即为终端装置在发送信息之前通过侦听获取其它终端装置的资源占用情况的一个时间段。其中，T 0由网络设备配置或预配置，
Figure PCTCN2021072278-appb-000002
由终端装置根据表1确定。表中的μ SL与终端装置的SL带宽部分(bandwidth part，BWP)对应的子载波间隔(sub-carrier spacing，SCS)有关，μ SL可以理解为SL BWP的SCS配置参数。具体的，子载波间隔SCS与μ SL的对应关系由下方的表2示出。终端装置可以根据表1和表2确定参数
Figure PCTCN2021072278-appb-000003
其中表1和表2为协议预定义的。一种可以理解地方式为，终端装置通过侦听时频资源集确定用于发送侧行信息的传输资源，具体是指侦听时频资源集中的侦听窗内的时频资源集来确定用于发送侧行信息的传输资源。
表1
Figure PCTCN2021072278-appb-000004
表2
μ SL Δf＝2 μ·15[kHz]
0 15
1 30
2 60
3 120
4 240
一个SCI可以调度至少一次侧行传输，例如PSSCH的传输，比如，一个SCI调度3次侧行传输，第1次侧行传输是一个PSSCH承载的数据的初传，后两次侧行传输是该数据的重传。再比如，一个SCI调度3次侧行传输，这3次侧行传输都是一个数据的重传。终端装置侦听到的SCI包括调度的侧行传输的时域和/或频域资源信息，体现数据业务周期的资源预约周期指示(可以通过资源预留值(resource reservation period)字段携带)，以及优先级信息(priority)等，具体地，优先级信息可以指示对应到调度的PSSCH优先级信息，和/或调度的PSSCH所关联的PSFCH的优先级信息，优先级信息指示优先级值，优先级值的取值可以为1,2,3,4,5,6,7,8中的任一个。也就是说，任何一个终端装置可以通过发送一个SCI来预约在未来的一个或多个时频资源用于发送待发送的SL信息的新传和/或重传。在一种示例中，终端装置在PSCCH上侦听和解码其他终端装置发送的侧行链路控制信息(sidelink control information，SCI)来获知其他终端装置在终端装置的选择窗的时频资源预约情况，进而确定在该终端装置选择窗内，比如，时隙[n+T 1,n+T 2]内，发送SL信息，其中，n+T 1为起始时隙编号，n+T 2为结尾时隙编号，T 1和T 2根据该终端装置的数据时延来确定。这样终端避免在选择窗内选择被已经其他终端装置预约的时频资源发送SL信息，以降低资源碰撞，提升SL信息传输的可靠性。
如果该终端装置在侦听窗时隙
Figure PCTCN2021072278-appb-000005
内的某个时隙上没有进行侦听，例如该终端装置在该时隙上处于发送状态，则由于半双工(half duplex)原因不能同时发送和接收，此时，该终端装置根据网络设备配置的或预配置的或预定义的资源预约周期信息，排除该时隙之后根据该资源预约周期信息确定的预约时域资源位于该终端装置的资源选择窗[n+T 1,n+T 2]内对应的时隙上所有的资源。该资源预约周期信息包括若干个资源预约周期值{P 1,P 2,P 3,…,P i}其中i＝1,2,3,4…16。
如图3所示，出示了一种资源选择示意图。例如第二终端装置在时隙m进行SL发送，从而不能在时隙m上侦听，根据配置的资源预约周期值P 1和P 2，在资源选择窗中排除时隙m+P′ 1和时隙m+P′ 2两个时隙上的所有资源,其中P′ 1和P′ 2是P 1和P 2所分别对应的在时频资源集内的逻辑周期值。
进一步地，如果同时满足以下条件，第二终端装置还将其他终端装置预约的在选择窗 内的时频资源排除在可以用于发送待发送侧行信息的时频资源之外，即排除不可用的时频资源：
1、第二终端装置在时隙
Figure PCTCN2021072278-appb-000006
收到SCI，该SCI中包括资源预约周期(resource reservation period)字段，携带资源预约周期指示，该资源预约周期指示的取值，是资源预约周期信息所指示的终端装置在该资源池中可能允许的资源预约周期值集合中的一个资源预约周期值，标记为P rsvp_RX，并且该SCI中的优先级(priority)字段指示了值prio RX；其中值P rsvp_RX为该SCI调度的PSSCH的周期，值prio RX为该SCI对应的PSSCH的优先级值。
Figure PCTCN2021072278-appb-000007
是侦听窗
Figure PCTCN2021072278-appb-000008
内的某个时隙。
2、第二终端装置根据该SCI确定的RSRP测量结果高于门限Th prioTX,prioRX，其中门限Th prioTX,prioRX为接收到的SCI中指示优先级值和第二终端装置的待发送数据对应的优先级值的函数。
3、第二终端装置在时隙
Figure PCTCN2021072278-appb-000009
收到的SCI所确定的预约的时频资源和选择窗内的时频资源存在重叠。
第二终端装置在其资源选择窗内排除不可用的时频资源后，可以确定资源选择窗内剩余的时频资源为可用的时频资源，从而在可用的时频资源中选择用于发送待发送的侧行信息的时频资源。资源选择窗为终端装置选择资源用于侧行信息传输的一个时间段。资源选择窗在时域上通常晚于侦听窗出现。
在一些实现方式中，可以减少第二终端装置在侦听窗内进行侦听的次数，以节约终端装置电量。比如，区别于对侦听窗，比如，时隙
Figure PCTCN2021072278-appb-000010
内的时隙进行侦听，只在时隙n之前的一部分时隙进行侦听(称为部分侦听)，根据部分侦听的结果确定用于发送SL信息的时频资源。比如，第二终端装置不进行侦听，通过随机选择的方式选择用于发送SL信息的时频资源。
由于受限于半双工的约束，当第二终端装置在侦听窗内，没有对某个时隙进行侦听时，无法获知该时隙上其他终端装置的SCI信息，即无法获知该时隙上其他终端装置的预约信息，则只能在该第二终端装置的资源选择窗内将所有可能的基于该时隙上预约的周期性资源全部从可用资源中排除。这样容易导致过度排除，导致可用资源减少，资源利用率降低，增加了不同终端装置之间资源选择的碰撞概率，降低传输可靠性。进一步地，由于该第二终端装置不能获知该时隙上其他终端装置的预约信息，也会导致侦听结果不完整进而增加了和其他终端装置资源选择的碰撞概率，降低了传输可靠性。
为此，本申请实施例提出了一种通信的方法，可以提高资源利用率。
该通信方法中，采用辅助终端装置提供被辅助终端装置自身无法确定的侦听结果信息，用于辅助终端装置进行资源选择，包括从可用资源中排除被指示为存在碰撞的资源，保留被指示为不存在碰撞的资源为可用资源。
本申请应用在V2X、D2D等终端装置和终端装置直接通信的系统中，适用于有网络覆盖和无网络覆盖的通信场景，终端装置自主选择资源的传输模式。终端装置可以在网络设备覆盖范围内，也可以在网络设备覆盖范围外，如图4所示，出示了本申请实施例适用的通信场景示意图。发送侧行信息和接收侧行信息的两个终端装置可以都在网络设备的覆盖范围内；发送侧行信息的和接收侧行信息的两个终端装置中，其中一个终端装置可以在网 络设备的覆盖范围内，另一个终端装置可以在网络设备的覆盖范围外；发送侧行信息和接收侧行信息的两个终端装置可以都在网络设备的覆盖范围外。本申请对此不做限定。
如图5所示，出示了本申请实施例提出了一种通信的方法的示意性流程交互图。
501，第二终端装置在第一时隙发送第二侧行信息。应理解，第一时隙可以指一个时隙，也可以指多个时隙。第一时隙为第二终端装置侦听窗内的时隙；侦听窗在发送侧行信息的资源选择窗之前。
第一时隙中包括至少一个子信道，第二终端装置可以利用第一时隙中的至少一个第一子信道发送第二侧行信息，其中，至少一个第一子信道属于至少一个子信道。
510，第一终端装置在第一时隙接收来自第三终端装置的第一侧行信息。可以理解，第三终端装置是指除了第一终端和第二终端之外的其他终端。在第一时隙发送第一侧行信息的第三终端装置可能为一个，也可能为多个，则第一终端装置可以在第一时隙接收至少一个第三终端装置发送的至少一个第一侧行信息。其中，第一侧行信息和第二侧行信息可以为PSCCH，也可以为PSCCH和PSSCH。本申请实施例中的第二终端为半双工装置。第一终端装置、第二终端装置和第三终端装置为终端设备。第一终端装置可以理解为辅助终端装置，第二终端装置可以理解为被辅助终端装置。
可选的，第一终端装置在第一时隙接收来自第二终端装置发送的第二侧行信息；并根据在第一时隙接收来自第二终端装置的第二侧行信息，确定第一时隙为第二终端装置发送第二侧行信息的时隙。在某些情况下，第二终端装置在第一时隙发送的不是第二侧行信息，而是在第一时隙向网络设备发送上行信息，此时，第一时隙也是第二终端装置发送信息的时隙，而第二终端装置会发送指示信息告知第一终端装置第二终端装置在第一时隙上向网络设备发送了上行信息，或者第二终端装置会通过指示信息告知第一终端装置第一时隙为第二终端装置发送信息的时隙。
第一终端设备在第一时隙进行侦听，接收至少一个第三终端装置发送的至少一个第一侧行信息。或者，第一终端装置根据第二终端装置在第一时隙之前发送的侧行信息中的资源预约周期信息获知第二终端设备需要在第一时隙发送第二侧行信息，即获知第二终端设备不能在第一时隙进行侦听，则第一终端设备在第一时隙进行侦听，接收至少一个第三终端装置发送的至少一个第一侧行信息。
应理解，第一终端装置在侦听过程中，是侦听每一个时隙上的除了第一终端装置之外的其他终端装置发送的SCI，所以在第一时隙接收来自第三终端装置的第一侧行信息的同时可以接收到第二终端装置发送的第二侧行信息，并不是第二终端装置发送第二侧行信息触发了第一终端装置接收来自第三终端装置的第一侧行信息，也不是第三终端装置发送第一侧行信息触发了第一终端装置接收来自第二终端装置的第二侧行信息。
520，第一终端装置根据第一侧行信息，确定第一时隙中可用的时频资源和/或不可用的时频资源。第一终端装置可以仅确定出资源池中哪些时频资源可用，也可以仅确定出资源池中哪些时频资源不可用，还可以同时确定出资源池中哪些时频资源可用、哪些时频资源不可用，本申请实施例对此不做任何限定。本申请实施例中，可用的时频资源可以为检测的信号强度低于一定阈值的资源，即这样的资源会被认为没有被占用而可用，相反的，不可用的时频资源即可以为检测的信号强度高于一定阈值的资源，即这样的资源会被认为被占用而不可用。
可选的，第一终端装置可以根据接收的来自至少一个第三终端装置的至少一个第一侧行信息，确定第一时隙的所有子信道中除至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。应理解，第二终端装置在第一时隙利用至少一个第一子信道发送第二侧行信息，则第一终端装置可以不关心至少一个第一子信道对于第二终端装置来说是否为可用的时频资源，可以由第二终端装置自行判断。
具体而言，第一终端装置可以根据第一阈值，确定第一时隙的所有子信道中除至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。第一时隙的所有子信道中除至少一个第一子信道外的剩余子信道可以称为第二子信道，第二子信道可以为一个，也可以为多个。
第一阈值可以是第一终端装置根据第二终端装置发送的SCI中承载的优先级信息确定的一个门限值Th(pi,pi)，也可以是第一终端装置根据网络配置或预配置的优先级信息确定的一个门限值Th(pi,pi)，例如，网络配置或预配置的优先级信息取值可以为1,2,3,4,5,6,7,8中任意一个。具体地，优先级信息确定的该门限值方法可以是：Th(pi,pi)是一个变量为pi和pi的函数值，其中pi为接收到第三终端装置发送的SCI所承载的优先级值，pi为第二终端装置发送的SCI中承载的优先级值或网络配置或预配置的优先值。网络设备配置或预配置一个门限值集合，该门限值集合中包括多个门限值，Th(pi,pi)的取值为该门限值集合中多个门限值里的第i个门限值，其中i＝p i+(p i-1)*8。
在一种实现方式中，第一终端装置在第一时隙上接收到第三终端装置利用第二子信道发送的第一侧行信息，第一终端装置在该第二子信道上测量参考信号接收功率RSRP，具体地可以是针对PSSCH的解调参考符号(de-modulation reference signal，DMRS)进行的RSRP测量，并根据该RSRP和第一阈值的比较，来确定第二子信道是否为可用的时频资源。若RSRP大于第一阈值，则第一终端装置确定第二子信道为不可用的时频资源；若RSRP小于或等于第一阈值，则第一终端装置确定第二子信道为可用的时频资源。
例如，第一终端装置确定网络设备预配置的资源池中包括7个子信道，包括子信道#1、子信道#2、子信道#3、子信道#4、子信道#5、子信道#6和子信道#7，第一终端装置可以在第一时隙上对每个子信道进行侦听。第一终端装置接收第二终端装置发送的第二侧行信息，确定第二终端装置发送PSSCH占用2个子信道，即子信道#3和子信道#4。则第一终端装置只需确定除子信道#3和子信道#4之外的其他子信道中可用的时频资源和/或不可用的时频资源。如图6所示，出示了本申请实施例的一种资源选择示意图。
第一终端装置接收到UE-1发送的第一侧行信息，确定UE-1发送PSSCH占用子信道#6和子信道#7，并在子信道#6和子信道#7上分别测量参考信号接收功率RSRP，测量获得的RSRP均大于第一阈值，则确定子信道#6和子信道#7为不可用的时频资源。第一终端装置接收到UE-2发送的第一侧行信息，确定UE-2发送PSSCH占用子信道#1，并在子信道#1上测量RSRP，该RSRP大于第一阈值，确定子信道#1为不可用的时频资源。第一终端装置没有在子信道#2和子信道#5接收到第一侧行信息，则确定子信道#2和子信道#5为可用的时频资源；或者，第一终端装置在子信道#2和子信道#5上接收到第一侧行信息，但是在子信道#2和子信道#5上测量的RSRP小于或等于第一阈值，则确定子信道#2和子信道#5为可用的时频资源。其中，没有接收到第一侧行信息也可以理解为没有其他终端 装置发送第一侧行信息或不能正确译码其他终端装置发送的第一侧行信息，接收到第一侧行信息可以理解为对第一侧行信息译码成功。UE-1和UE-2为第三终端装置。
因此，第一终端装置确定子信道#1、子信道#6和子信道#7为不可用的时频资源，确定子信道#2和子信道#5为可用的时频资源。可以理解的，第一终端确定的不可用的时频资源或可用的时频资源是针对第二终端装置而言的，因为第二终端装置没有在第一时隙进行侦听，是第一终端装置帮助或协助第二终端装置在第一时隙侦听，确定第二终端装置在第二终端装置的选择窗内的不可用的时频资源或可用的时频资源。
在另一种实现方式中，第一终端装置在第一时隙上接收到第三终端装置利用第二子信道发送的第一侧行信息，第一终端装置在该第二子信道上测量参考信号接收功率RSRP，并根据该RSRP、第一阈值和该第一侧行信息中包括的资源预约周期，来确定第二子信道是否为可用的时频资源。若该RSRP大于第一阈值，且用于调度该第二子信道上的数据的SCI，即第一侧行信息中包括的资源预留周期(resource reservation period)字段存在，且该资源预留周期字段所携带的资源预约周期指示的值大于零，则第一终端装置确定该第二子信道为不可用的时频资源；若该RSRP小于或等于第一阈值，第一终端装置都确定第二子信道为可用的时频资源；若第一侧行信息中包括的资源预约周期指示的值等于零，或者，第一侧行信息中不存在资源预约周期指示，第一终端装置都确定第二子信道为可用的时频资源。
例如，第一终端装置确定网络设备预配置的资源池中包括7个子信道，包括子信道#1、子信道#2、子信道#3、子信道#4、子信道#5、子信道#6和子信道#7，第一终端装置可以在第一时隙上对每个子信道进行侦听。第一终端装置接收第二终端装置发送的第二侧行信息，确定第二终端装置发送PSSCH占用2个子信道，即子信道#3和子信道#4。则第一终端装置只需确定除子信道#3和子信道#4之外的其他子信道中可用的时频资源和/或不可用的时频资源。如图7所示，出示了本申请实施例的另一种资源选择示意图。
第一终端装置接收到UE-1发送的第一侧行信息，确定UE-1发送PSSCH占用子信道#6和子信道#7，并在子信道#6和子信道#7上分别测量参考信号接收功率RSRP，测量获得的RSRP大于第一阈值，则说明子信道#6和子信道#7在第一时隙被占用，且第一侧行信息中包括的资源预约周期指示的值大于零，说明会给第二终端装置的未来资源选择带来冲突，则确定子信道#6和子信道#7为不可用的时频资源。第一终端装置接收到UE-2发送的第一侧行信息，确定UE-2发送PSSCH占用子信道#1，并在子信道#1上测量RSRP，该RSRP大于第一阈值，且该第一侧行信息中包括的资源预约周期指示的值等于零，或者，第一侧行信息中不存在资源预约周期指示，说明虽然子信道#1在第一时隙被占用，但是不会给第二终端装置的未来资源选择带来冲突，则确定子信道#1为可用的时频资源。第一终端装置没有在子信道#2和子信道#5接收到第一侧行信息，则确定子信道#2和子信道#5为可用的时频资源；或者，第一终端装置在子信道#2和子信道#5上接收到第一侧行信息，但是在子信道#2和子信道#5上测量的RSRP小于或等于第一阈值，该情况下无论第一侧行信息中包括的资源预约周期指示的值等于零还是大于零，都不会给第二终端装置的未来资源选择带来冲突，则确定子信道#2和子信道#5为可用的时频资源。其中，UE-1和UE-2为第三终端装置。
因此，第一终端装置确定子信道#6和子信道#7为不可用的时频资源，确定子信道#1、 子信道#2和子信道#5为可用的时频资源。
可选的，第一终端装置可以根据第一侧行信息和第二侧行信息，确定第一时隙中所有子信道中可用的时频资源和/或不可用的时频资源。
具体而言，第一终端装置可以根据第一阈值，确定第一时隙的所有子信道中除至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。第一终端装置可以根据第二阈值，确定至少一个第一子信道中可用的时频资源和/或不可用的时频资源，其中，第二阈值大于第一阈值。第一时隙的所有子信道中除至少一个第一子信道外的剩余子信道可以称为第二子信道，第二子信道可以为一个，也可以为多个。一种实施方式，第二阈值＝第一阈值+偏移值，所述偏移值可以是网络设备配置的，或预配置的，或预定义(例如偏移值＝3dB)，偏移值的取值是正数，单位为dB。
第一阈值可以是第一终端装置根据第二终端装置发送的SCI中承载的优先级信息确定的一个门限值，也可以是第一终端装置根据网络配置或预配置的优先级信息确定的一个门限值，例如取值为1,2,3,4,5,6,7,8中任意一个。
第二阈值可以是网络设备配置的，例如通过RRC信令配置的，或者，可以是网络设备预配置的，或者，可以是第一终端装置配置给第二终端装置的，例如通过PC-5RRC信令、SCI信息，或者，可以是第二终端装置配置给第一终端装置的；也可以是根据第一终端装置和/或第二终端装置的优先级信息确定的。本申请实施例对此不做任何限定。
第一终端装置根据第一阈值，确定第一时隙的所有子信道中除至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源的具体过程同上述所述。
在一种实现方式中，第一终端装置接收第二终端装置在第一时隙利用至少一个第一子信道发送的第二侧行信息，第一终端装置在至少一个第一子信道上测量参考信号接收功率RSRP，并根据该RSRP和第二阈值的比较，来确定至少一个第一子信道是否为可用的时频资源。若RSRP大于第二阈值，说明该子信道资源冲突，即不止一个终端装置在第一时隙使用至少一个第一子信道发送侧行信息，则第一终端装置确定至少一个第一子信道为不可用的时频资源；若RSRP小于或等于第二阈值，说明仅第二终端装置在第一时隙使用至少一个第一子信道发送侧行信息，则第一终端装置确定该至少一个第一子信道为可用的时频资源。
例如，第一终端装置确定网络设备预配置的资源池中包括7个子信道，包括子信道#1、子信道#2、子信道#3、子信道#4、子信道#5、子信道#6和子信道#7，第一终端装置可以在第一时隙上对每个子信道进行侦听，确定第一时隙中7个子信道中可用的时频资源和/或不可用的时频资源。第一终端装置接收第二终端装置发送的第二侧行信息，确定第二终端装置发送PSSCH占用2个子信道，即子信道#3和子信道#4，在子信道#3和子信道#4上分别测量参考信号接收功率RSRP，测量获得的RSRP大于第二阈值，说明子信道#3和子信道#4资源冲突，确定子信道#3和子信道#4为不可用的时频资源。第一终端装置接收到UE-1发送的第一侧行信息，确定UE-1发送PSSCH占用子信道#6和子信道#7，并在子信道#6和子信道#7上分别测量参考信号接收功率RSRP，测量获得的RSRP大于第一阈值，确定子信道#6和子信道#7为不可用的时频资源。第一终端装置接收到UE-2发送的第一侧行信息，确定UE-2发送PSSCH占用子信道#1，并在子信道#1上测量RSRP，该RSRP大于第一阈值，确定子信道#1为不可用的时频资源。第一终端装置没有在子信道#2和子信 道#5接收到第一侧行信息，则确定子信道#2和子信道#5为可用的时频资源；或者，第一终端装置在子信道#2和子信道#5上接收到第一侧行信息，但是在子信道#2和子信道#5上测量的RSRP小于或等于第一阈值，则确定子信道#2和子信道#5为可用的时频资源。UE-1和UE-2为第三终端装置。因此，第一终端装置确定子信道#1、子信道#3、子信道#4、子信道#6和子信道#7为不可用的时频资源，确定子信道#2和子信道#5为可用的时频资源。
又例如，第一终端装置确定网络设备预配置的资源池中包括7个子信道，包括子信道#1、子信道#2、子信道#3、子信道#4、子信道#5、子信道#6和子信道#7，第一终端装置可以在第一时隙上对每个子信道进行侦听，确定第一时隙中7个子信道中可用的时频资源和/或不可用的时频资源。第一终端装置接收第二终端装置发送的第二侧行信息，确定第二终端装置发送PSSCH占用2个子信道，即子信道#3和子信道#4，在子信道#3和子信道#4上分别测量参考信号接收功率RSRP，测量获得的RSRP大于第二阈值，说明子信道#3和子信道#4资源冲突，确定子信道#3和子信道#4为不可用的时频资源。第一终端装置接收到UE-1发送的第一侧行信息，确定UE-1发送PSSCH占用子信道#6和子信道#7，并在子信道#6和子信道#7上分别测量参考信号接收功率RSRP，测量获得的RSRP大于第一阈值，则说明子信道#6和子信道#7在第一时隙被占用，且第一侧行信息中包括的资源预约周期指示的值大于零，说明会给第二终端装置的未来资源选择带来冲突，则确定子信道#6和子信道#7为不可用的时频资源。第一终端装置接收到UE-2发送的第一侧行信息，确定UE-2发送PSSCH占用子信道#1，并在子信道#1上测量RSRP，该RSRP大于第一阈值，且该第一侧行信息中包括的资源预约周期指示的值等于零，或者，第一侧行信息中不存在资源预约周期指示，说明虽然子信道#1在第一时隙被占用，但是不会给第二终端装置的未来资源选择带来冲突，则确定子信道#1为可用的时频资源。第一终端装置没有在子信道#2和子信道#5接收到第一侧行信息，则确定子信道#2和子信道#5为可用的时频资源；或者，第一终端装置在子信道#2和子信道#5上接收到第一侧行信息，但是在子信道#2和子信道#5上测量的RSRP小于或等于第一阈值，该情况下无论第一侧行信息中包括的资源预约周期指示的值等于零还是大于零，都不会给第二终端装置的未来资源选择带来冲突，则确定子信道#2和子信道#5为可用的时频资源。其中，UE-1和UE-2为第三终端装置。因此，第一终端装置确定子信道#3、子信道#4、子信道#6和子信道#7为不可用的时频资源，确定子信道#1、子信道#2和子信道#5为可用的时频资源。
在另一种实现方式中，第一终端装置接收第二终端装置在第一时隙利用至少一个第一子信道发送的第二侧行信息，但是第一终端装置对第二侧行信息无法正确译码或译码失败，则认为有除第二终端装置之外的其他终端装置利用第一子信道发送侧行信息，说明该第一子信道资源冲突，则第一终端装置确定至少一个第一子信道为不可用的时频资源。
可选的，第一终端装置可以仅根据第一侧行信息，确定第一时隙中所有子信道中可用的时频资源和/或不可用的时频资源。第一终端装置接收到的至少一个第三终端装置发送的至少一个第一侧行信息所占用的子信道可能与第二终端装置发送第二侧行信息所占用的子信道冲突，因此，第一终端装置也可以仅根据第一侧行信息确定第一时隙中所有子信道中可用的时频资源和/或不可用的时频资源。
同理，第一终端装置也可以仅根据第二侧行信息，确定第一时隙中所有子信道中可用的时频资源和/或不可用的时频资源。
530，第一终端装置向第二终端装置发送第一指示信息，第一指示信息用于指示第一时隙中可用的时频资源和/或不可用的时频资源，换言之，第一指示信息用于指示第一时隙中可用的子信道和/或不可用的子信道。
可选的，第一指示信息可以用于指示第一时隙的所有子信道中可用的时频资源，也可以用于指示第一时隙的所有子信道中不可用的时频资源，还可以用于指示第一时隙的所有子信道中可用的时频资源和不可用的时频资源。
可选的，第一指示信息可以用于指示第一时隙的所有子信道中除至少一个第一子信道外的剩余子信道中可用的时频资源，也可以用于指示第一时隙的所有子信道中除至少一个第一子信道外的剩余子信道中不可用的时频资源，还可以用于指示第一时隙的所有子信道中除至少一个第一子信道外的剩余子信道中可用的时频资源和不可用的时频资源。
时频资源可以体现在第一时隙上的一个或多个子信道。第一指示信息中可以包括N个比特，N为可以用于发送侧行信息的资源池中子信道的个数，或者，为资源池中除了第一子信道的之外的子信道的个数，即第二子信道的个数。N个比特中每一个比特都可以和资源池中每个子信道，或者，资源池中除了第一子信道的之外的每个子信道一一对应，用于指示每个子信道是否可用。例如，当一个比特取值为“1”时，表示该比特对应的子信道是不可用的，当一个比特取值为“0”时，表示该比特对应的子信道是可用的；反之，也适用。
可选的，第一终端装置可以在物理侧行反馈信道(physical sidelink feedback channel，PSFCH)上向第二终端装置发送第一指示信息。承载第一指示信息的PSFCH的资源可以由资源池配置信息提供。PSFCH资源是正交的(orthogonal)，即不重叠的。
在一种实现方式中，一个PSFCH资源包括一个物理资源块(physical resource block，PRB)，第一终端装置可以通过发送连续的或离散的N个PSFCH承载N个比特信息，即每个PRB承载一个比特信息。
在另一种实现方式中，一个PSFCH资源包括N个PRB，第一终端装置可以通过发送该一个PSFCH承载N个比特信息。
具体地，该一个比特信息可以用序列的不同循环移位(cyclic shift)方式表示比特信息值为“1”或“0”。用于承载第一指示信息的PSFCH的时域资源在第一时隙之后，间隔不小于K个时隙，K的取值为大于等于0的正整数，K可以承载于资源池的配置信息中，例如取值2或3。对于第二终端装置在第一时隙上用来发送PSSCH所占用的子信道所对应的比特信息，第一终端装置可以不发送，或者规定发送一个特定值，例如“1”或“0”，第二终端装置本身不对自己该比特信息做任何解读和处理，因为第二终端装置知道是自己使用该比特信息所对应的子信道来传输PSSCH。
如图8所示，出示了本申请实施例的第一指示信息发送的示意图。例如，资源池中包括7个子信道，则包括7个比特信息，用于指示这个7个子信道中每个子信道的是否为可用的时频资源，其中，第1个比特信息和第2个比特信息对应子信道#1和子信道#2，发送对应比特信息值为“1”和“0”的序列；第一终端装置不发送第3个比特信息和第4个比特信息；其余比特信息值则为“0”或“1”，用于指示对应子信道#5、子信道#6和子信道#7的是否可用。比特信息可以均承载于PSFCH资源中，PSFCH的时域资源和时隙m的间隔大于或等于配置的K值，在图8中K值为3。需要注意的是，PSFCH只是承载第一指示信息的是一个示例，第一指示信息还可以承载于PSCCH或PSSCH中，例如，还可 以承载于第二级SCI中或MAC CE或PC5-RRC中。
540，第二终端装置接收来自第一终端装置的第一指示信息。具体而言，第二终端装置可以在物理侧行反馈信道PSFCH上接收来自第一终端装置的第一指示信息。
550，第二终端装置根据第一指示信息，确定资源选择窗中用于发送第三侧行信息的时频资源。具体而言，第二终端装置根据第一指示信息，排除根据资源预约周期指示确定的预约时频资源位于资源选择窗中不可用的时频资源，根据可用的时频资源发送第三侧行信息。其中，发送第三侧行信息的时隙是在第一时隙之后的某个时隙。
假设配置的资源预约周期指示的值为P 1和P 2，对应地，在一个资源池中的逻辑资源预约周期指示的值为P′ 1和P′ 2，第一时隙为时隙m，第二终端装置可以在资源选择窗中排除时隙m+P′ 1和时隙m+P′ 2上第一指示信息指示为不可用的子信道，确定时隙m+P′ 1和时隙m+P′ 2的第一指示信息指示为可用的子信道为可用的时频资源。可选的，如果第二终端装置在第一时隙发送的也是周期性的第二信息，第二终端装置可以根据实际的在第二信息所包含的资源预约周期指示的值可以排除时隙m+P′ 1或时隙m+P′ 2上的至少一个第一子信道。
第二终端装置也可以根据自己实际占用的资源排除不可用的时频资源。可选的，如果第二终端装置只在时隙m+P′ 1进行了预约，那么第二终端装置可以只排除时隙m+P′ 1上的第一指示信息指示为不可用的子信道，时隙m+P′ 1上的第一指示信息指示为可用的子信道为可用的时频资源；如果第二终端装置只在时隙m+P′ 2进行了预约，那么第二终端装置可以只排除时隙m+P′ 2上的第一指示信息指示为不可用的子信道，时隙m+P′ 2上的第一指示信息指示为可用的子信道为可用的时频资源。
若第一终端装置发送的第一指示信息指示第二终端装置在第一时隙发送第二侧行信息的至少一个第一子信道为不可用的时频资源，即第一终端设备确定至少一个第一子信道为冲突的时频资源，或者第一终端设备对接收的第二侧行信息解码失败，则第二终端装置可以排除时隙m+P′ 1和时隙m+P′ 2上至少一个第一子信道，重新选择可用的子信道发送第三侧行信息。
若第一终端装置发送的第一指示信息指示第二终端装置在第一时隙发送第二侧行信息的至少一个第一子信道为不可用的时频资源，但是，第二终端装置收到了其他终端装置发送的针对第二侧行信息的肯定确认(acknowledgement，ACK)信息，则第二终端装置可以在时隙m+P′ 1和时隙m+P′ 2上使用第一子信道发送的第三侧行信息。
若第一终端装置发送的第一指示信息指示第二终端装置在第一时隙发送第二侧行信息的至少一个第一子信道为不可用的时频资源，且第二终端装置收到了其他终端装置发送的针对第二侧行信息的否定确认(negative acknowledgement，NACK)信息，则第二终端装置在时隙m+P′ 1和时隙m+P′ 2上不使用至少一个第一子信道发送第三侧行信息。
除了由于半双工问题的导致的终端装置没有侦听时隙的情况，还有可能是因为节能原因，终端装置在由连续的时隙组成的一个时间段内侦听一部分时隙来进行资源选择，包括执行部分侦听(partial sensing)资源选择和配置DRX(Discontinuous Reception)进行非连续接收进行资源选择。为了方便描述，用基于部分侦听进行资源选择来描述上述资源选择的方式。在所述一个时间段内，由于终端装置只根据一部分时隙来确定侦听结果，所述侦听结果并不能完整反映所述一个时间段内完整的时频资源预约情况，进而会导致在选择窗内选择的时频资源可能其他终端装置预约的资源发生碰撞。一种解决的方法是，选择时 隙m用于待发送的SL信息的时频资源，在时隙m-T 3终端装置进行资源的重评估和抢占检测，
Figure PCTCN2021072278-appb-000011
的取值由表1确定。即，在发送待数据之前，对用于发送所述待发送的SL信息的时频资源进行重评估和抢占检测，包括，至少侦听时隙m-T 3，确定在时隙m-T 3上所接收的侧行控制信息所指示的时频资源是否和时隙m上用于发送所述待发送的SL信息的时频资源重叠：如果重叠，则对重叠的时频资源进行重选(re-select)；如果不重叠，则在时隙m上发送所述待发送的SL信息。如果，终端装置在每次待发送的SL信息之前，根据部分侦听进行资源选择的方式所选择的用于发送待发送的SL信息的时频资源进行重评估和抢占检测，那么，侦听和译码所带来耗能会比较大，不利于节能。所以，终端装置可以根据一些触发条件来确定至少在时隙m-T 3上进行重评估和抢占检测，用来确定在时隙m上用于发送待发送的SL信息的时频资源进行重选。即，在发送待发送的SL信息之前，根据触发条件，确定对用于发送所述待发送的SL信息的时频资源进行重评估和抢占检测，所述触发条件包括：
终端装置根据在发送待发送的SL信息之前接收的反馈信息，确定对用于发送所述待发送的SL信息的时频资源进行重评估和抢占检测，所述反馈信息包括HARQ反馈信息，所述HARQ反馈信息用于指示在发送待发送的SL信息之前发送的数据的接收状态。例如，如果所述数据被所述数据的接收终端装置正确接收，则收到所述接收终端装置的ACK反馈；如果所述数据没有被所述数据的接收终端装置正确接收，则收到所述接收终端装置的NACK反馈。具体地，当所述终端装置在发送待发送的SL信息之前的一段时间内连续接收了N 1个或N 1个以上的NACK反馈，触发对用于发送所述待发送的SL信息的时频资源进行重评估和抢占检测；或，当所述终端装置在发送待发送的SL信息之前的一段时间内累计接收了N 2个或N 2个以上的NACK反馈，触发对用于发送所述待发送的SL信息的时频资源进行重评估和抢占检测；其中，所述终端装置通过网络侧设备的配置信息，或预配置，或预定义的方式获得N 1和N 2。其中，所述一段时间包括连续的多个时隙，所述多个时隙的个数可以是网络侧设备配置的，预配置的，或预定义的。在一段时间内，连续接收HARQ反馈信息的数量或者累计接收HARQ反馈信息的数量，可以一定程度反映当前信道的干扰水平，即信道干扰水平越高，则越有可能发生资源选择碰撞，进而导致所发送的数据碰撞，那么此时进行重评估和抢占检测可以提前发送所选择的时频资源碰撞，进行触发资源重选，降低碰撞，提升数据传输可靠性；反之，当信道干扰水平越低，则发生资源选择碰撞的概率越低，考虑节能因素，则不需要进行重评估和抢占检测。应理解，所述终端装置可以是第一终端装置，也可以第二终端装置，也可以是第三终端装置。
还有一种情况，第二终端装置被网络设备调度在所述第一终端装置的侦听窗内的至少一个时隙进行上行传输，由于半双工的限制，所述第二终端装置无法对用于上行传输的时隙进行侦听。第一终端装置不能正确译码所述第二终端装置向网络设备发送的上行信息，无法判断所述上行传输的时隙(第一时隙)为所述第二终端装置不能进行侦听的时隙，则，无法向所述第二终端装置发送第一指示信息用于辅助第二终端装置进行资源选择。一种解决方案是，第二终端装置在接收到网络设备的上行调度信息，所述上行调度信息指示上行资源所在的时隙，在上行资源所在的时隙之前，将所述上行资源所在的时隙告知第一终端装置，所述上行资源所在的时隙承载于第四侧行信息中。所述第四侧行信息，可以是侧行控制信息(SCI)，或侧行MAC CE，或者PC5-RRC信令，即第一终端装置通过接收第 二终端装置发送的所述第四侧行信息，获取所述用于上行传输的时隙，第一终端装置确定所述用于上行传输的时隙为第一时隙，然后在第一时隙进行侦听，确定第一时隙中可用的时频资源和/或不可用的时频资源，并向所述第二终端装置发送用于确定发送第三侧行信息的时频资源的第一指示信息。
应理解，第二终端装置在一个侦听窗中可能有多个未检测的时隙，第一终端装置可以在多个第二终端装置未检测的时隙通过侦听来确定第一指示信息，或者第一终端装置可以确定多个第一指示信息，并将多个第一指示信息发送给第二终端装置，则第二终端装置可以根据多个第一指示信息确定资源选择窗中用于发送第三侧行信息的时频资源。
在本申请实施例提供的技术方案中，第二终端装置在第一时隙发送第二侧行信息导致无法侦听其他终端装置发送侧行信息使用的时频资源或预约的时频资源信息，第一终端装置在该第一时隙通过侦听可以获知其他终端装置(包括第二终端装置和/或至少一个第三终端装置)发送侧行信息使用的时频资源或预约的时频资源信息，并将确定的可用的时频资源和/或不可用的时频资源通过第一指示信息指示给第二终端装置，可以避免第二终端装置基于资源预约周期指示将可用的周期性时频资源全部排除，使可用的时频资源增加，从而提高资源利用率。除此之外，可用资源的增加可以减少不同终端装置之间资源选择的碰撞概率，能够提高传输的可靠性。
本申请实施例提出了一种通信装置900，该通信装置可以应用于图5方法实施例中的第一终端装置，也可以是实现图5实施例中方法的部件，例如一种芯片。如图9所示，出示了本申请实施例的一种通信装置900的示意性框图。该通信装置900包括：
收发单元910，用于在第一时隙接收来自第三终端装置的第一侧行信息；
处理单元920，用于根据所述第一侧行信息确定所述第一时隙中可用的时频资源和/或不可用的时频资源；
所述收发单元910还用于，向第二终端装置发送第一指示信息，所述第一指示信息用于指示所述第一时隙中可用的时频资源和/或不可用的时频资源，所述第一时隙为所述第二终端装置发送第二侧行信息的时隙。
本申请实施例中，收发单元在执行发送步骤时可以为发送单元，在执行接收步骤时可以为接收单元，另外，收发单元可以由收发器代替，发送单元可以由发送器代替，接收单元可以由接收器代替。
可选的，所述收发单元910还用于，在所述第一时隙上接收来自所述第二终端装置的所述第二侧行信息；
所述处理单元920还用于，根据在所述第一时隙上接收来自所述第二终端装置的所述第二侧行信息确定所述第一时隙为所述第二终端装置发送所述第二侧行信息的时隙。
可选的，所述第一时隙位于所述第二终端装置的侦听窗中。
可选的，所述第一时隙中包括至少一个子信道，所述第一时隙中的至少一个第一子信道用于所述第二终端装置发送所述第二侧行信息，所述至少一个第一子信道属于所述至少一个子信道。
可选的，所述处理单元920具体用于：根据所述第一侧行信息和/或所述第二侧行信息，确定所述第一时隙的所有子信道中可用的时频资源和/或不可用的时频资源；或，根 据所述第一侧行信息，确定所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。
可选的，所述第一指示信息用于指示所述第一时隙的所有子信道中可用的时频资源和/或不可用的时频资源；或
所述第一指示信息用于指示所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。
可选的，所述处理单元920具体用于：
根据第一阈值，确定所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源；
根据第二阈值，确定所述至少一个第一子信道中可用的时频资源和/或不可用的时频资源，所述第二阈值大于所述第一阈值。
可选的，所述收发单元910还用于，在物理侧行反馈信道上向所述第二终端装置发送所述第一指示信息。
本申请实施例提出了另一种通信装置1000，该通信装置可以应用于图5方法实施例中的第二终端装置，也可以是实现图5实施例中方法的部件，例如一种芯片。如图10所示，出示了本申请实施例的一种通信装置1000的示意性框图。该通信装置1000包括：
收发单元1010，用于在第一时隙向第一终端装置发送第二侧行信息；
所述收发单元1010还用于，接收来自所述第一终端装置的第一指示信息，所述第一指示信息用于指示所述第一时隙中可用的时频资源和/或不可用的时频资源，其中，所述第一时隙中可用的时频资源和/或不可用的时频资源是所述第一终端装置根据在所述第一时隙接收的来自第三终端装置的第一侧行信息确定的；
处理单元1020，用于根据所述第一指示信息，确定发送第三侧行信息的时频资源。
可选的，所述第一时隙位于所述第二终端装置的侦听窗中。
可选的，所述第一时隙中包括至少一个子信道，所述第二终端装置在所述第一时隙的至少一个第一子信道向所述第一终端装置发送所述第二侧行信息，所述至少一个第一子信道属于所述至少一个子信道。
可选的，所述第一指示信息用于指示所述第一时隙的所有子信道中可用的时频资源和/或不可用的时频资源；或
所述第一指示信息用于指示所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。
可选的，所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源是根据第一阈值确定的；
所述至少一个第一子信道中可用的时频资源和/或不可用的时频资源是根据第二阈值确定的，所述第二阈值大于所述第一阈值。
可选的，所述收发单元1010还用于，在物理侧行反馈信道上接收来自所述第一终端装置的所述第一指示信息。
本申请实施例提出了一种通信装置1100，如图11所示，出示了本申请实施例的另一种通信装置的示意性框图。该通信装置1100包括处理器1110，所述处理器1110与至少一个存储器1120耦合，所述处理器1110用于读取所述至少一个存储器1120所存储的计 算机程序，以执行本申请实施例中任意可能的实现方式中的方法。
上述的处理器1110可能是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现场可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。
上述的存储器1120可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。
本申请实施例提供了一种通信芯片，包括处理器和通信接口，所述处理器用于读取指令或计算机程序以执行本申请实施例中的方法。
本申请实施例提供了一种通信系统1200，包括本申请实施例提供的通信的方法中的第一的终端装置1210和第二的终端装置1220。如图12所示，出示了本申请实施例的一种通信系统1200的示意性框图。
本申请实施例还提供了一种计算机可读存储介质，其上存储有用于实现本申请实施例中的方法的计算机程序。当该计算机程序在计算机上运行时，使得该计算机可以实现上述方法实施例中的方法。
本申请实施例还提供了一种计算机程序产品，当其在计算机上运行时，使得该计算机执行本申请实施例中的方法。
可以理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
可以理解，在本申请中，“当…时”、“若”以及“如果”均指在某种客观情况下装置会做出相应的处理，并非是限定时间，且也不要求装置实现时一定要有判断的动作，也不意味着存在其它限定。
本领域技术人员可以理解：本申请中涉及的第一、第二等各种数字编号仅为描述方便进行的区分，并不用来限制本申请实施例的范围。本申请中的编号(也可被称为索引)的具体取值、数量的具体取值、以及位置仅作为示意的目的，并不是唯一的表示形式，也并不用来限制本申请实施例的范围。本申请中涉及的第一个、第二个等各种数字编号也仅为描述方便进行的区分，并不用来限制本申请实施例的范围。
另外，本申请中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系；本申请中术语“至少一个”，可以表示“一个”和“两个或两个以上”，例如，A、B和C中至少一个，可以表示：单独存在A，单独存在B，单独存在C、同时存在A和B，同时存在A和C，同时存在C和B，同时存在A和B和C，这七种情况。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。本领域技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖 在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。所述权利要求的保护范围为准。

Claims (33)

  1. 一种通信方法，其特征在于，包括：
    第一终端装置在第一时隙上接收来自第三终端装置的第一侧行信息；
    所述第一终端装置根据所述第一侧行信息确定所述第一时隙中可用的时频资源和/或不可用的时频资源；
    所述第一终端装置向第二终端装置发送第一指示信息，所述第一指示信息用于指示所述第一时隙中可用的时频资源和/或不可用的时频资源，所述第一时隙为所述第二终端装置发送第二侧行信息的时隙。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述第一终端装置在所述第一时隙上接收来自所述第二终端装置的所述第二侧行信息；
    所述第一终端装置根据在所述第一时隙上接收来自所述第二终端装置的所述第二侧行信息确定所述第一时隙为所述第二终端装置发送所述第二侧行信息的时隙。
  3. 根据权利要求1或2所述的方法，其特征在于，
    所述第一时隙位于所述第二终端装置的侦听窗中。
  4. 根据权利要求1或2所述的方法，其特征在于，
    所述第一时隙中包括至少一个子信道，所述第一时隙中的至少一个第一子信道用于所述第二终端装置发送所述第二侧行信息，所述至少一个第一子信道属于所述至少一个子信道。
  5. 根据权利要求4所述的方法，其特征在于，所述第一终端装置根据所述第一侧行信息确定所述第一时隙中可用的时频资源和/或不可用的时频资源，包括：
    所述第一终端装置根据所述第一侧行信息和/或所述第二侧行信息，确定所述第一时隙的所有子信道中可用的时频资源和/或不可用的时频资源；或
    所述第一终端装置根据所述第一侧行信息，确定所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。
  6. 根据权利要求5所述的方法，其特征在于，
    所述第一指示信息用于指示所述第一时隙的所有子信道中可用的时频资源和/或不可用的时频资源；或
    所述第一指示信息用于指示所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。
  7. 根据权利要求5所述的方法，其特征在于，
    所述第一终端装置根据第一阈值，确定所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源；
    所述第一终端装置根据第二阈值，确定所述至少一个第一子信道中可用的时频资源和/或不可用的时频资源，所述第二阈值大于所述第一阈值。
  8. 根据权利要求1或2所述的方法，其特征在于，
    所述第一终端装置在物理侧行反馈信道上向所述第二终端装置发送所述第一指示信 息。
  9. 一种通信的方法，其特征在于，包括：
    第二终端装置在第一时隙向第一终端装置发送第二侧行信息；
    所述第二终端装置接收来自所述第一终端装置的第一指示信息，所述第一指示信息用于指示所述第一时隙中可用的时频资源和/或不可用的时频资源，其中，所述第一时隙中可用的时频资源和/或不可用的时频资源是所述第一终端装置根据在所述第一时隙接收的来自第三终端装置的第一侧行信息确定的；
    所述第二终端装置根据所述第一指示信息，确定发送第三侧行信息的时频资源。
  10. 根据权利要求9所述的方法，其特征在于，
    所述第一时隙位于所述第二终端装置的侦听窗中。
  11. 根据权利要求9或10所述的方法，其特征在于，
    所述第一时隙中包括至少一个子信道，所述第二终端装置在所述第一时隙的至少一个第一子信道向所述第一终端装置发送所述第二侧行信息，所述至少一个第一子信道属于所述至少一个子信道。
  12. 根据权利要求9至11中任一项所述的方法，其特征在于，
    所述第一指示信息用于指示所述第一时隙的所有子信道中可用的时频资源和/或不可用的时频资源；或
    所述第一指示信息用于指示所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。
  13. 根据权利要求12所述的方法，其特征在于，
    所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源是根据第一阈值确定的；
    所述至少一个第一子信道中可用的时频资源和/或不可用的时频资源是根据第二阈值确定的，所述第二阈值大于所述第一阈值。
  14. 根据权利要求9或10所述的方法，其特征在于，
    所述第二终端装置在物理侧行反馈信道上接收来自所述第一终端装置的所述第一指示信息。
  15. 一种第一终端装置，其特征在于，包括：
    收发单元，用于在第一时隙接收来自第三终端装置的第一侧行信息；
    处理单元，用于根据所述第一侧行信息确定所述第一时隙中可用的时频资源和/或不可用的时频资源；
    所述收发单元还用于，向第二终端装置发送第一指示信息，所述第一指示信息用于指示所述第一时隙中可用的时频资源和/或不可用的时频资源，所述第一时隙为所述第二终端装置发送第二侧行信息的时隙。
  16. 根据权利要求15所述的第一终端装置，其特征在于，
    所述收发单元还用于，在所述第一时隙上接收来自所述第二终端装置的所述第二侧行信息；
    所述处理单元还用于，根据在所述第一时隙上接收来自所述第二终端装置的所述第二侧行信息确定所述第一时隙为所述第二终端装置发送所述第二侧行信息的时隙。
  17. 根据权利要求15或16所述的第一终端装置，其特征在于，
    所述第一时隙位于所述第二终端装置的侦听窗中。
  18. 根据权利要求15或16所述的第一终端装置，其特征在于，
    所述第一时隙中包括至少一个子信道，所述第一时隙中的至少一个第一子信道用于所述第二终端装置发送所述第二侧行信息，所述至少一个第一子信道属于所述至少一个子信道。
  19. 根据权利要求18所述的第一终端装置，其特征在于，所述处理单元具体用于：
    根据所述第一侧行信息和/或所述第二侧行信息，确定所述第一时隙的所有子信道中可用的时频资源和/或不可用的时频资源；或
    根据所述第一侧行信息，确定所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。
  20. 根据权利要求19所述的第一终端装置，其特征在于，
    所述第一指示信息用于指示所述第一时隙的所有子信道中可用的时频资源和/或不可用的时频资源；或
    所述第一指示信息用于指示所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。
  21. 根据权利要求19所述的第一终端装置，其特征在于，所述处理单元具体用于：
    根据第一阈值，确定所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源；
    根据第二阈值，确定所述至少一个第一子信道中可用的时频资源和/或不可用的时频资源，所述第二阈值大于所述第一阈值。
  22. 根据权利要求15或16所述的第一终端装置，其特征在于，
    所述收发单元还用于，在物理侧行反馈信道上向所述第二终端装置发送所述第一指示信息。
  23. 一种第二终端装置，其特征在于，包括：
    收发单元，用于在第一时隙向第一终端装置发送第二侧行信息；
    所述收发单元还用于，接收来自所述第一终端装置的第一指示信息，所述第一指示信息用于指示所述第一时隙中可用的时频资源和/或不可用的时频资源，其中，所述第一时隙中可用的时频资源和/或不可用的时频资源是所述第一终端装置根据在所述第一时隙接收的来自第三终端装置的第一侧行信息确定的；
    处理单元，用于根据所述第一指示信息，确定发送第三侧行信息的时频资源。
  24. 根据权利要求23所述的第二终端装置，其特征在于，
    所述第一时隙位于所述第二终端装置的侦听窗中。
  25. 根据权利要求23或24所述的第二终端装置，其特征在于，
    所述第一时隙中包括至少一个子信道，所述第二终端装置在所述第一时隙的至少一个第一子信道向所述第一终端装置发送所述第二侧行信息，所述至少一个第一子信道属于所述至少一个子信道。
  26. 根据权利要求23至25中任一项所述的第二终端装置，其特征在于，
    所述第一指示信息用于指示所述第一时隙的所有子信道中可用的时频资源和/或不可 用的时频资源；或
    所述第一指示信息用于指示所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源。
  27. 根据权利要求26所述的第二终端装置，其特征在于，
    所述第一时隙的所有子信道中除所述至少一个第一子信道外的剩余子信道中可用的时频资源和/或不可用的时频资源是根据第一阈值确定的；
    所述至少一个第一子信道中可用的时频资源和/或不可用的时频资源是根据第二阈值确定的，所述第二阈值大于所述第一阈值。
  28. 根据权利要求23或24所述的第二终端装置，其特征在于，
    所述收发单元还用于，在物理侧行反馈信道上接收来自所述第一终端装置的所述第一指示信息。
  29. 一种通信装置，其特征在于，包括处理器，所述处理器与至少一个存储器耦合，所述处理器用于读取所述至少一个存储器所存储的计算机程序，以执行如权利要求1至8中任意一项所述的方法，或执行如权利要求9至14中任意一项所述的方法。
  30. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质用于存储计算机程序，当所述计算机程序在计算机上运行时，使得所述计算机执行如权利要求1至8中任意一项所述的方法，或者使得所述计算机执行如权利要求9至14中任意一项所述的方法。
  31. 一种计算机程序产品，当其在计算机上运行时，使得该计算机执行如权利要求1至8中任意一项所述的方法，或者使得所述计算机执行如权利要求9至14中任意一项所述的方法。
  32. 一种芯片，其特征在于，包括处理器和通信接口，所述处理器用于读取指令或计算机程序以执行如权利要求1至8中任意一项所述的方法，或者使得所述计算机执行如权利要求9至14中任意一项所述的方法。
  33. 一种通信系统，其特征在于，包括如权利要求15至22中任意一项所述的第一终端装置，以及包括如权利要求23至28中任意一项所述第二终端装置。
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